Mozilla Firefox is too slow? Here's how to speed it up.Is Firefox Running Slow? 6 Tips and Tweaks to Speed Up Firefox.Why is Firefox so Slow? 2021 Fix For Mozilla Firefox Slow Windows 10.In case if it's needed in the future, I'm attaching an updated version of the Golang file upload speed test tool, to be used on two devices on the same network (but not Raspberry Pi). Multiple aspects of your web browser like cookies, extensions and software bugs can appear to slow your internet connection speeds to a Browser feeling sluggish? Speed up Chrome, Firefox, Safari and Edge The reason downgrading TLS worked is that HTTP/2 downgrades to HTTP/1.1 with TLS 1.1, and HTTP/1.1 doesn't have the flow control problem on Firefox.
