Issue 143776 in chromium: Animated GIF appears to freeze for a while and cause poor scrolling framerate

[chro...@googlecode.com]

Status: Untriaged
Owner: ----
CC: hc...@chromium.org
Labels: Type-Bug Pri-2 Area-Internals Stability-Performance

New issue 143776 by jba...@chromium.org: Animated GIF appears to freeze for
a while and cause poor scrolling framerate
http://code.google.com/p/chromium/issues/detail?id=143776

Version: 21.0.1180.77
OS: Linux

What steps will reproduce the problem?
1. Go to g+ page with animated gifs. Internal page "GIFS!" worked well.
2. Scroll the gifs offscreen for a while. Then scroll back.

What is the expected output? What do you see instead?
After scrolling, I expect the GIF to immediately resume animating. Instead,
it freezes for a while, during which the renderer is clearly straining to
paint -- scrolling has a poor FPS while the GIF is frozen.

I attached a trace to prove it! The heavy looking frames are when the GIF
was frozen. The heavy frames show 19 GIF decode calls that take a total of
43ms to complete.

Attachments:
linux_trace_animated_gif_freeze_bug.json.zip 455 KB

[chro...@googlecode.com]

Comment #4 on issue 143776 by dennis.s...@gmail.com: Animated GIF appears

to freeze for a while and cause poor scrolling framerate
http://code.google.com/p/chromium/issues/detail?id=143776

http://chromemanygifsslow.azurewebsites.net/

test page with 9000 small animated gifs.

Another thing that caught my eye is when scrolled up, the gifs will animate
nicely, but
the further you scroll down, the slower the gifs will animate. I did this
test because many tumblr pages with animated gifs become unusable slow when
scrolling down.

Firefox does fine btw.

[chro...@googlecode.com]

Comment #6 on issue 143776 by asaf.ma...@emaze.com: Animated GIF appears to

freeze for a while and cause poor scrolling framerate

https://code.google.com/p/chromium/issues/detail?id=143776

Here is a link to a page with 3D transforms that completely freeze the GIF
http://app.emaze.com/@AFFOZIOQ.

tested on
Chrome/47.0.2526.106,
OS: windows 8 & 10.

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