Maybe like this?

Author: dvdplm

scripts/gitlab/test-linux.sh

@@ -14,4 +14,4 @@ rustup default $1
 rustup show
 
 echo "________Running Parity Full Test Suite________"
-RUSTFLAGS="-C opt-level=3" time cargo test $OPTIONS --features "$FEATURES" --locked --all --target $CARGO_TARGET --verbose --color=always -- --test-threads $THREADS
+RUSTFLAGS="-C opt-level=3 -C overflow-checks=off -C incremental=false -C debuginfo=2" time cargo test $OPTIONS --features "$FEATURES" --locked --all --target $CARGO_TARGET --verbose --color=always -- --test-threads $THREADS