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A comment on Firefox has surpassed Chrome on Speedometer. Parent comment

Re:Firefox has surpassed Chrome on Speedometer by kenniskrag on Tuesday July 18, 2023 @10:24AM (#36772820)
TL;DR: Windows Defender had a bug that made certain system calls expensive on CPU cycles when Defender's Real-time Protection feature is enabled. After discovery, Mozilla reported this issue to Microsoft. Microsoft is releasing a patch that should result in lower CPU usage when using Firefox on sites like YouTube (a ~75% CPU usage reduction was noted when browsing YouTube in Firefox with the fixed version of Defender).

https://news.ycombinator.com/item?id=35458746

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