Open Bug 1942652 Opened 26 days ago Updated 9 days ago

Loading delibs.com/cd74 with a spoofed Chrome UA causes massive jank

Categories

(Core :: Performance, defect)

defect

Tracking

()

Performance Impact low

People

(Reporter: denschub, Unassigned)

References

()

Details

(Keywords: perf:responsiveness, reproducible)

  1. Open https://delibs.com/cd74
  2. Use Chrome Mask to spoof as Chrome and have the site reload

On the reload, it looks like it never finishes, but it's actually just the content process being very unhappy. I captured a profile of what's happening here: https://share.firefox.dev/3Q3q39b

The profile implies that there are some very deeply nested tables. Is Chrome faster at handling deeply nested tables, or is there another difference in behavior that causes the page to create deeply nested tables in Firefox but not in Chrome?

The Performance Impact Calculator has determined this bug's performance impact to be low. If you'd like to request re-triage, you can reset the Performance Impact flag to "?" or needinfo the triage sheriff.

Impact on site: Renders site effectively unusable
Configuration: Rare
Websites affected: Rare
[x] Able to reproduce locally

Performance Impact: --- → low
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