wasm-opt is 35x slower on windows compared to linux

[jspanchu]

See the output produced by building a ~46MB wasm binary and ~47MB JSPI wasm binary using EMCC_DEBUG=2.

On linux:

profiler:DEBUG: block "wasm_opt" took 46.559 seconds

On windows:

profiler:DEBUG: block "wasm_opt" took 1565.294 seconds

Complete build log:

1. windows compile_output.log

2. linux compile_output.log

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 4.0.10 (b7dc6e5747465580df5984e723b9d1f10d8e804b)
Copyright (C) 2025 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

wasm-opt version 123 (version_123-168-g8c82b6884)

[tlively]

Are you able to reproduce this by calling wasm-opt directly? If so, would you be able to profile the wasm-opt run on Windows and share the results?

[jspanchu]

Added the --debug arg to wasm-opt

link:DEBUG: using binaryen
shared:DEBUG: successfully executed 'C:/dev/trame-vtklocal/dev/emsdk/upstream\bin\wasm-opt.exe' --version
reading...
reading binary from bin\addonWebAssembly.wasm
Loading 'bin\addonWebAssembly.wasm'...
running passes...
[PassRunner] running passes
[PassRunner]   running pass: strip-target-features... 0.0003187 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: post-emscripten...       removeData: removing whole segment
removeData: start/stop symbols not found (__start_em_js, __stop_em_js)
removeData: start/stop symbols not found (__start_em_lib_deps, __stop_em_lib_deps)
0.802761 seconds.
[PassRunner]   (validating)
[PassRunner] passes took 0.80308 seconds.
[PassRunner] (final validation)
[PassRunner] running passes
[PassRunner]   running pass: duplicate-function-elimination...     [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.556305 seconds.
[PassRunner] nested passes took 0.556305 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.435878 seconds.
[PassRunner] nested passes took 0.435878 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.526486 seconds.
[PassRunner] nested passes took 0.526486 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.375267 seconds.
[PassRunner] nested passes took 0.375267 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.514158 seconds.
[PassRunner] nested passes took 0.514158 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.364753 seconds.
[PassRunner] nested passes took 0.364753 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.513661 seconds.
[PassRunner] nested passes took 0.513661 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.33908 seconds.
[PassRunner] nested passes took 0.33908 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.516308 seconds.
[PassRunner] nested passes took 0.516308 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.339763 seconds.
[PassRunner] nested passes took 0.339763 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.508749 seconds.
[PassRunner] nested passes took 0.508749 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.327876 seconds.
[PassRunner] nested passes took 0.327876 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.520676 seconds.
[PassRunner] nested passes took 0.520676 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.313825 seconds.
[PassRunner] nested passes took 0.313825 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.506792 seconds.
[PassRunner] nested passes took 0.506792 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.314467 seconds.
[PassRunner] nested passes took 0.314467 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.503674 seconds.
[PassRunner] nested passes took 0.503674 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.310924 seconds.
[PassRunner] nested passes took 0.310924 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.506439 seconds.
[PassRunner] nested passes took 0.506439 seconds.
8.91383 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-module-elements...      0.801982 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: memory-packing...                     [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.313427 seconds.
[PassRunner] nested passes took 0.313427 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.319921 seconds.
[PassRunner] nested passes took 0.319921 seconds.
0.770384 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: once-reduction...                     [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.332337 seconds.
[PassRunner] nested passes took 0.332337 seconds.
0.367268 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: ssa-nomerge...                        6.97152 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: dce...                                3.00278 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-names...                0.522011 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-brs...                  2.60739 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-names...                0.455973 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: optimize-instructions...              4.36377 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: pick-load-signs...                    0.60997 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: precompute-propagate...               12.3418 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: optimize-added-constants-propagate... 10.1663 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: code-pushing...                       1.09689 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: tuple-optimization...                 0.0234369 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: simplify-locals-nostructure...        30.6987 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: vacuum...                             4.82714 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: reorder-locals...                     0.760593 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-brs...                  2.10769 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: merge-locals...                       3.89933 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: coalesce-locals...                    6.71078 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: local-cse...                          7.29697 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: simplify-locals...                    30.1371 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: vacuum...                             4.14732 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: reorder-locals...                     0.664374 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: coalesce-locals...                    5.86078 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: reorder-locals...                     0.634818 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: vacuum...                             4.00306 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: code-folding...                       1.69728 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: merge-blocks...                       1.73593 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-brs...                  2.50519 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-names...                0.463544 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: merge-blocks...                       1.82466 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: precompute-propagate...               9.45911 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: optimize-instructions...              3.41236 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: rse...                                4.09718 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: vacuum...                             4.03699 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: dae-optimizing...                     [PassRunner] running nested passes
[PassRunner]   running pass: ... 3.47214 seconds.
[PassRunner] nested passes took 3.47214 seconds.
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[PassRunner] nested passes took 0.817221 seconds.
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[PassRunner] nested passes took 8.12709 seconds.
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[PassRunner] nested passes took 3.01562 seconds.
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[PassRunner] nested passes took 0.539528 seconds.
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[PassRunner] nested passes took 1.42488 seconds.
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[PassRunner] nested passes took 2.7125 seconds.
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[PassRunner] nested passes took 0.535533 seconds.
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[PassRunner] nested passes took 1.20592 seconds.
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[PassRunner] nested passes took 0.192675 seconds.
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[PassRunner] nested passes took 0.644734 seconds.
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[PassRunner] nested passes took 3.19822 seconds.
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[PassRunner] nested passes took 0.623906 seconds.
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[PassRunner]   running pass: ... 0.0748884 seconds.
[PassRunner]   running pass: ... 0.0586695 seconds.
[PassRunner] nested passes took 1.99026 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 3.56918 seconds.
[PassRunner] nested passes took 3.56918 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0351507 seconds.
[PassRunner]   running pass: ... 0.0193074 seconds.
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[PassRunner]   running pass: ... 0.0265406 seconds.
[PassRunner] nested passes took 0.846876 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0577625 seconds.
[PassRunner] nested passes took 0.0577625 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0393641 seconds.
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[PassRunner]   running pass: ... 0.0231639 seconds.
[PassRunner] nested passes took 0.880616 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0595677 seconds.
[PassRunner] nested passes took 0.0595677 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0298697 seconds.
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[PassRunner]   running pass: ... 0.0332244 seconds.
[PassRunner]   running pass: ... 0.0215875 seconds.
[PassRunner] nested passes took 0.7293 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0254981 seconds.
[PassRunner] nested passes took 0.0254981 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0309527 seconds.
[PassRunner]   running pass: ... 0.0180324 seconds.
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[PassRunner]   running pass: ... 0.0174223 seconds.
[PassRunner]   running pass: ... 0.0344857 seconds.
[PassRunner]   running pass: ... 0.0156614 seconds.
[PassRunner] nested passes took 0.707957 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0264902 seconds.
[PassRunner] nested passes took 0.0264902 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0523563 seconds.
[PassRunner]   running pass: ... 0.0360276 seconds.
[PassRunner]   running pass: ... 0.0248246 seconds.
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[PassRunner]   running pass: ... 0.0466036 seconds.
[PassRunner]   running pass: ... 0.0407396 seconds.
[PassRunner]   running pass: ... 0.0320271 seconds.
[PassRunner] nested passes took 1.11326 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0419801 seconds.
[PassRunner] nested passes took 0.0419801 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0372772 seconds.
[PassRunner]   running pass: ... 0.0151516 seconds.
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[PassRunner]   running pass: ... 0.0291481 seconds.
[PassRunner]   running pass: ... 0.0155856 seconds.
[PassRunner] nested passes took 0.660425 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0370396 seconds.
[PassRunner] nested passes took 0.0370396 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0261671 seconds.
[PassRunner]   running pass: ... 0.0141295 seconds.
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[PassRunner]   running pass: ... 0.0313697 seconds.
[PassRunner]   running pass: ... 0.0150741 seconds.
[PassRunner] nested passes took 0.618466 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.024702 seconds.
[PassRunner] nested passes took 0.024702 seconds.
50.515 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: inlining-optimizing...                [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.636732 seconds.
[PassRunner] nested passes took 0.636732 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.389033 seconds.
[PassRunner] nested passes took 0.389033 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 2.21304 seconds.
[PassRunner]   running pass: ... 13.6992 seconds.
[PassRunner]   running pass: ... 17.1583 seconds.
[PassRunner]   running pass: ... 3.07614 seconds.
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[PassRunner]   running pass: ... 10.521 seconds.
[PassRunner]   running pass: ... 6.77866 seconds.
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[PassRunner]   running pass: ... 35.5445 seconds.
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[PassRunner]   running pass: ... 47.893 seconds.
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[PassRunner]   running pass: ... 9.46809 seconds.
[PassRunner]   running pass: ... 2.51588 seconds.
[PassRunner]   running pass: ... 4.32265 seconds.
[PassRunner]   running pass: ... 4.35982 seconds.
[PassRunner] nested passes took 265.696 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.589854 seconds.
[PassRunner] nested passes took 0.589854 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.34241 seconds.
[PassRunner] nested passes took 0.34241 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 1.39784 seconds.
[PassRunner]   running pass: ... 10.6635 seconds.
[PassRunner]   running pass: ... 10.5318 seconds.
[PassRunner]   running pass: ... 2.60078 seconds.
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[PassRunner]   running pass: ... 8.64434 seconds.
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[PassRunner]   running pass: ... 25.3974 seconds.
[PassRunner]   running pass: ... 5.34119 seconds.
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[PassRunner]   running pass: ... 60.7444 seconds.
[PassRunner]   running pass: ... 5.02817 seconds.
[PassRunner]   running pass: ... 105.212 seconds.
[PassRunner]   running pass: ... 8.60823 seconds.
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[PassRunner]   running pass: ... 2.17671 seconds.
[PassRunner]   running pass: ... 3.92906 seconds.
[PassRunner]   running pass: ... 3.99849 seconds.
[PassRunner] nested passes took 312.757 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.568733 seconds.
[PassRunner] nested passes took 0.568733 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.314172 seconds.
[PassRunner] nested passes took 0.314172 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.663436 seconds.
[PassRunner]   running pass: ... 5.83749 seconds.
[PassRunner]   running pass: ... 8.44294 seconds.
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[PassRunner]   running pass: ... 1.11822 seconds.
[PassRunner]   running pass: ... 2.43132 seconds.
[PassRunner]   running pass: ... 2.46319 seconds.
[PassRunner] nested passes took 118.831 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.56171 seconds.
[PassRunner] nested passes took 0.56171 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.302397 seconds.
[PassRunner] nested passes took 0.302397 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0713248 seconds.
[PassRunner]   running pass: ... 0.613376 seconds.
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[PassRunner]   running pass: ... 0.0955248 seconds.
[PassRunner]   running pass: ... 0.216018 seconds.
[PassRunner]   running pass: ... 0.146625 seconds.
[PassRunner] nested passes took 10.5101 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.568525 seconds.
[PassRunner] nested passes took 0.568525 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.322009 seconds.
[PassRunner] nested passes took 0.322009 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.0284486 seconds.
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[PassRunner]   running pass: ... 0.0121762 seconds.
[PassRunner]   running pass: ... 1.38286 seconds.
[PassRunner]   running pass: ... 0.131004 seconds.
[PassRunner]   running pass: ... 0.0210166 seconds.
[PassRunner]   running pass: ... 0.0349784 seconds.
[PassRunner]   running pass: ... 0.182416 seconds.
[PassRunner]   running pass: ... 0.153681 seconds.
[PassRunner]   running pass: ... 0.094972 seconds.
[PassRunner]   running pass: ... 0.360894 seconds.
[PassRunner]   running pass: ... 0.0569729 seconds.
[PassRunner]   running pass: ... 0.0184198 seconds.
[PassRunner]   running pass: ... 0.0876896 seconds.
[PassRunner]   running pass: ... 0.0183137 seconds.
[PassRunner]   running pass: ... 0.057262 seconds.
[PassRunner]   running pass: ... 0.0337452 seconds.
[PassRunner]   running pass: ... 0.039321 seconds.
[PassRunner]   running pass: ... 0.0350629 seconds.
[PassRunner]   running pass: ... 0.0168354 seconds.
[PassRunner]   running pass: ... 0.0404384 seconds.
[PassRunner]   running pass: ... 0.133657 seconds.
[PassRunner]   running pass: ... 0.0486878 seconds.
[PassRunner]   running pass: ... 0.0686102 seconds.
[PassRunner]   running pass: ... 0.0574554 seconds.
[PassRunner] nested passes took 4.08703 seconds.
717.431 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: duplicate-function-elimination...     [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.448872 seconds.
[PassRunner] nested passes took 0.448872 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.353031 seconds.
[PassRunner] nested passes took 0.353031 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.447099 seconds.
[PassRunner] nested passes took 0.447099 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.275387 seconds.
[PassRunner] nested passes took 0.275387 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.439453 seconds.
[PassRunner] nested passes took 0.439453 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.264691 seconds.
[PassRunner] nested passes took 0.264691 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.44542 seconds.
[PassRunner] nested passes took 0.44542 seconds.
2.79146 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: duplicate-import-elimination...       0.0003021 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: simplify-globals-optimizing...        [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.754067 seconds.
[PassRunner] nested passes took 0.754067 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 0.279065 seconds.
[PassRunner] nested passes took 0.279065 seconds.
[PassRunner] running nested passes
[PassRunner]   running pass: ... 3.88915 seconds.
[PassRunner] nested passes took 3.88915 seconds.
4.93018 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: remove-unused-module-elements...      0.686872 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: reorder-globals...                    0.0036436 seconds.
[PassRunner]   (validating)
[PassRunner]   running pass: directize...                          [PassRunner] running nested passes
[PassRunner]   running pass: ... 0.271746 seconds.
[PassRunner] nested passes took 0.271746 seconds.
0.345946 seconds.
[PassRunner]   (validating)
[PassRunner] passes took 960.701 seconds.
[PassRunner] (final validation)
[PassRunner] running passes
[PassRunner] passes took 0 seconds.
[PassRunner] (final validation)
writing...
writing binary to bin\addonWebAssembly.wasm
Opening 'bin\addonWebAssembly.wasm'
shared:DEBUG: successfully executed 'C:/dev/trame-vtklocal/dev/emsdk/upstream\bin\wasm-opt' --strip-target-features --post-emscripten -O3 --low-memory-unused --zero-filled-memory --pass-arg=directize-initial-contents-immutable --no-stack-ir --debug 'bin\addonWebAssembly.wasm' -o 'bin\addonWebAssembly.wasm' --mvp-features --enable-bulk-memory --enable-bulk-memory-opt --enable-call-indirect-overlong --enable-exception-handling --enable-multivalue --enable-mutable-globals --enable-nontrapping-float-to-int --enable-reference-types --enable-sign-ext
building:DEBUG: saving intermediate file C:\Users\JASWAN~1.PAN\AppData\Local\Temp\emscripten_temp\emcc-05-wasm-opt.wasm
building:DEBUG: saving intermediate file C:\Users\JASWAN~1.PAN\AppData\Local\Temp\emscripten_temp\emcc-06-byn.wasm
profiler:DEBUG: block "wasm_opt" took 973.052 seconds

[kripken]

Looks like most of the time is taken up in inlining-optimizing, which is not surprising for a large file with many inlining and followup opportunities. But I'm afraid it doesn't help explain why Windows is slower.

Perhaps running the Windows system profiler can find something interesting? E.g. if locks are very high in the profile, perhaps using mimalloc would help - I believe we only do so for Linux atm.

[jspanchu]

Is there a way to skip wasm-opt and still keep -O3? I want to run wasm-opt on an unoptimized .wasm file manually through a profiler instead of using emcc.

[kripken]

Hmm, there is no good way, but you can hack the code like this, to remove the part that calls wasm-opt -O3

diff --git a/tools/link.py b/tools/link.py
index 0dc2dba0d1..9b8bcaa261 100644
--- a/tools/link.py
+++ b/tools/link.py
@@ -2301,12 +2301,6 @@ def phase_binaryen(target, options, wasm_target):
     # that. see https://github.com/emscripten-core/emscripten/issues/15269
     if settings.GENERATE_DWARF:
       diagnostics.warning('limited-postlink-optimizations', 'running limited binaryen optimizations because DWARF info requested (or indirectly required)')
-    with ToolchainProfiler.profile_block('wasm_opt'):
-      building.run_wasm_opt(wasm_target,
-                            wasm_target,
-                            args=passes,
-                            debug=intermediate_debug_info)
-      building.save_intermediate(wasm_target, 'byn.wasm')
 
   if settings.EVAL_CTORS:
     with ToolchainProfiler.profile_block('eval_ctors'):