RESOLVED DUPLICATE of bug 246335 251506
WebGL in <iframe> is very slow with Metal 
https://bugs.webkit.org/show_bug.cgi?id=251506
Summary WebGL in <iframe> is very slow with Metal
Marcin
Reported 2023-02-01 04:37:53 PST
WebGL in <iframe> is very slow with Metal backend enabled. - Disabling Metal backend solves the problem. - I've tried limiting resolution to the minimum 160x90, but it does not help. - I've observed massive battery drain, so it is probably not just Safari is throttling the RAF inside iframe.
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Add attachment proposed patch, testcase, etc.
Kimmo Kinnunen
Comment 1 2023-02-01 06:38:33 PST
Thanks for the report. If you have set of .html files for a simple repro, that would be very helpful.
Marcin
Comment 2 2023-02-01 08:07:01 PST
My mistake Kimmo. While preparing the test files for you, I realized that I am using flat variables in the shaders (inside the test iframe). The slowdown has nothing to do with iframes but with https://bugs.webkit.org/show_bug.cgi?id=246335 I apologize for submitting this false report.
Kimmo Kinnunen
Comment 3 2023-02-01 23:10:14 PST
Thanks for letting us know. Once bug 251259 ships, many algorithms using flat shading can use provoking vertex extension to select the most performant configuration for particular platform. *** This bug has been marked as a duplicate of bug 246335 ***
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