User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:184.108.40.206) Gecko/2008120122 Firefox/3.0.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:220.127.116.11) Gecko/2008120122 Firefox/3.0.5 When smooth scrolling in a page that has a large element that has the CSS position:fixed property, the CPU usage becomes insanely high, almost always 100% for the core in use. Usually the visual lag is visible as well. I can't say this next thing with certainty, but I believe that if a page has many elements, such as a big table, the visual lag becomes worse. I've supplied a slashdot article as an example, because the comments bar becomes fixed when you scroll down non-members and members who didn't change that setting. Reproducible: Always Steps to Reproduce: 1. Visit a site with a large element that has the CSS position:fixed property. 2. Make sure smooth scrolling is enabled 3. Watch the CPU usage and/or visual lag when scrolling (quickly). Actual Results: Visual lag Expected Results: Scrolling as if everything was dandy.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 372039
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