Grid: single track span optimisation #343
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This was accidentally included in #344. So it has been merged, just not via this PR. |
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Objective
Improve performance of CSS Grid context sizing.
Changes made
Implements Section 11.4.2 of the CSS Grid spc "Size tracks to fit non-spanning items". This is a specialised variant of Section 11.4.3 "Increase sizes to accommodate spanning items crossing content-sized tracks" that defines an optimised intrinsic track sizing algorithm for the case where an item spans exactly 1 track (the most common case).
Performance results
A 50% performance improvement for the "deep" benchmarks (which are the most realistic). More modest 5-15% improvements on the "wide" and "superdeep" benchmarks. This brings our 6500 node random track benchmark down to ~8ms. This is still slower than flexbox at 10000 nodes (~5ms) but isn't that far off (roughly 2x), and from what I've read we should expect grid to be a little slower than flexbox. It's also a lot better than the ~540ms that this benchmark was taking when it was first created, or even the ~24ms it was taking this morning.
As of this PR, I'm considering performance good enough for release.