Why is firefox UI so slow? : rfirefox

After the update yesterday to Firefox Quantum, I can no longer use Firefox on my desktop. It is slow, it hangs and then freezes. I've tried everything in the troubleshooting section (profiles, drivers, refresh, fresh install, everything.) I am posting

若您的工作管理員等監控工具顯示您的電腦資源正在高度使用中，請試試看 Firefox 使用太多的記憶體 - 如何修正 與 Firefox 耗用過多 CPU 資源 - 如何解決 這兩篇文章當中的建議。

Many Firefox users have encountered this issue, and it can be incredibly frustrating when your browser takes ages to load pages, freezes frequently, or crashes unexpectedly. However, there are steps you can take to prevent Firefox from getting unbearably

To fix the slow-down issue on Firefox, you need to Clear Unnecessary Memories of Firefox. However, sometimes Removing Cache Data on Firefox isn't enough to Increase Firefox's slow-down issue Speed.

為什麼Firefox這麼慢？ 有什麼方法可以使Firefox在設備上更快地運行？ 閱讀本文以了解Firefox緩慢的原因和修復方法。

Anyway, yeah, firefox's UI is just remnants from years and years and years of old code, whereas vivaldi is brand spanking new. It's just how things like that go.