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A comment on Firefox 57.0 Released. Parent comment

Re:Firefox 57.0 Released by DiThi on Tuesday November 14, 2017 @12:16PM (#15697015)
What OS, CPU, etc? It's pretty fast to me.
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Re:Firefox 57.0 Released by baby on Tuesday November 14, 2017 @03:40PM (#15698900)
MacOS Sierra, 3.1 Ghz Intel i7, 16GB of DDR3, SSD, ...

I have no idea why it's so slow.

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Re:Firefox 57.0 Released by shabbyrobe on Thursday November 16, 2017 @03:31AM (#15711056)
It's uber slow for me too. Similar specs. Several hundred millisecond tab switches with a clean profile. Typing into slack is like typing into an SSH session over a bad dialup connection. Adding Tree Style Tabs kept my CPU over 20% and my fans running permanently. Maybe it's faster for people on Windows or Linux, but on macOS it's a major regression.
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