251403 2023-01-30 16:43:22 -0800 WebP video slows to a crawl on the first loop 2023-01-31 13:03:27 -0800 1 1 1 Unclassified WebKit Media Other Unspecified Unspecified RESOLVED INVALID https://bugs.webkit.org/show_bug.cgi?id=248755 InRadar P2 Normal --- 1 brandonstewart webkit-unassigned ap e sabouhallawa webkit-bug-importer oldest_to_newest 1929600 0 brandonstewart 2023-01-30 16:43:22 -0800 https://just-eat-prod-eu-res.cloudinary.com/video/upload/w_900,q_auto,e_loop,fl_animated,f_webp,fl_awebp/Experiments/Rosie%20gif%20test/JUST_EAT_PAD_THAI_1.webp 1929603 1 webkit-bug-importer 2023-01-30 16:46:58 -0800 <rdar://problem/104843448> 1929605 2 e 2023-01-30 16:52:56 -0800 Looks like this has been noticed by someone else, too (example URL no longer resolves, though): https://discussions.apple.com/thread/252594380 1929821 3 sabouhallawa 2023-01-31 11:56:44 -0800 The slow animation happens in the first ‘loop’ only. Once the animation starts over, playback occurs at normal speed. 1929822 4 sabouhallawa 2023-01-31 11:57:39 -0800 rdar://100568410 1929840 5 ap 2023-01-31 13:03:27 -0800 Updating the title, as I observe identical behavior in STP and in shipping Safari. Also, marking as INVALID, because we currently believe this issue to be below WebKit is system frameworks.