Bug 260468
| Summary: | XSLT can take minutes to render with many <audio> elements | ||
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| Product: | WebKit | Reporter: | Jonathan del Strother <jon> |
| Component: | Media | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED MOVED | ||
| Severity: | Normal | CC: | ap, eric.carlson, jer.noble, simon.fraser, webkit-bug-importer, zalan |
| Priority: | P2 | Keywords: | InRadar |
| Version: | Safari 16 | ||
| Hardware: | Mac (Apple Silicon) | ||
| OS: | macOS 13 | ||
| See Also: | https://bugs.webkit.org/show_bug.cgi?id=262165 | ||
Jonathan del Strother
I'd like to use XSLT to transform RSS feeds into user-viewable pages.
When Safari renders lots of <audio> elements via XSLT, it behaves terribly - seemingly getting exponentially slower as the number of <audio> elements increases.
On a sample feed with 515 episodes, Safari 16.5.2 appears to freeze while loading the page for around 52 seconds on my M1 Macbook Pro. Meanwhile a 2016 MBP takes 3 minutes 10 seconds…
Firefox & Chrome both render the same page more-or-less instantly.
Here’s the sample page with 515 episodes: https://d1k0jgp8xx8zuc.cloudfront.net/jds/xsl/fish.rss
But for the sake of everyone’s sanity if you don’t want to sit there waiting for it to load, here’s a version with 100 episodes: https://d1k0jgp8xx8zuc.cloudfront.net/jds/xsl/fish-truncated.rss . It ‘only’ takes 5 seconds to render, but hopefully that’s enough to demonstrate the problem.
(I've also filed this via Feedback Assistant, if that helps: FB12904190)
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Alexey Proskuryakov
It is a known issue that rendering a page with many media elements is pathologically slow, but I cannot find the tracking bug now.
Doing an outrageous amount of work under HTMLMediaElement::ensureMediaControls() -> HTMLMediaElement::setupAndCallJS() -> ... jsCSSStyleDeclaration_propertyValueForCamelCasedIDLAttribute() ... Document::updateStyleIfNeeded().
Radar WebKit Bug Importer
<rdar://problem/114278433>
Alexey Proskuryakov
rdar://113627244
Simon Fraser (smfr)
This is covered by <rdar://77347577>.
Jonathan del Strother
Could you let us know the status of rdar://77347577 ?