Likely the iframes in this page run slower than 60fps.
This is because the browser does not check if the iframes needing a RAF event are actually on the screen
This makes it so using WebGL to explain things (for example a page about Physics) with lots of WebGL based diagrams problematic.
Hopefully browsers will fix this issue.
Compare to the wrapped version.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4