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Are you experiencing this pause on Windows, Mac OS, or Linux? I ask because my employer has some crap McAfee security theatre software installed (Windows) that

Are you experiencing this pause on Windows, Mac OS, or Linux? I ask because my employer has some crap McAfee security theatre software installed (Windows) that causes this same issue for me for any application that loads any large-ish file (or large number of files) on startup. Since Firefox is going to load a bazillion things from cache on startup it (or similar software) could be causing the problem. I had support temporarily disable McAfee's "on-access scanner" thing so I could test it and the problem went away immediately. Everything was nice and snappy again! Of course, they turned it back on after the test...

nostalgk 7y ago
I'm experiencing it exclusively on Windows, as I don't use Linux for web browsing. I don't have any anti virus other than MalwareBytes and Windows Defender, and I've completely turned off all forms of caching for Firefox in a vain attempt to fix this. I guess maybe it could be Windows Defender? Doesn't quite explain why the Firefox process is the one that is sucking literally my entire r/w bandwidth, slowing my computer to a crawl and inhibiting all OS functions. Defender does this every once in a while, randomly, but it doesn't show up during Firefox's start-up. It works fine after like a minute of warm-up, but I still think that's unacceptable on an SSD. Still gonna use Firefox of course...