Slow commit processing for large set calls in arrays

[joepio]

Pressing enter a bunch of times in a large document leads to slow responses. Like, 1s + responses.

I need to know why these commits are so hard to process. They should be way faster.

I checked out the --trace chrome --log-level trace json file in perfetto, which showed me that for every item in the set call, atomic-server does a check_if_atom_matches_watched_query_filters, which takes about 10 milliseconds.

There are probably a bunch of ways in which we can make this more efficient:

Do not process every atom, only those who are different

If we go from [a,b,c,d] to [a,b,c,e], we could ignore [a,b,c]. We can make a diff, and only remove d and add e.

Make check_if... faster

I'm not sure how, though.