2015309 - Modified codepen demo (https://codepen.io/shubniggurath/pen/RNaWvdm?editors=0010) is slower in Firefox

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Mayank Bansal]

Go to https://codepen.io/shubniggurath/pen/RNaWvdm?editors=0010
In the js-pane, change the following:

gridSize = 50 -----> gridSize = 1
Let it recompile and run.

Firefox: https://share.firefox.dev/4rA9l1D / https://share.firefox.dev/3MiaA6L
Chrome: https://share.firefox.dev/4bHGML3

Comment 1

[Iain Ireland [:iain]]

Biggest thing that stands out is we're spending significantly more time doing Set.add in the query function (23% of our profile, vs 4% of V8's). Bug 2015006 is a case of Map.add being slower, which is a similar code path.

Still not clear that this is a high priority in the real world, but we should keep an eye on it.