Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox scrolling and video laggy when maximized at 4K on KDE Plasma Archlinux

  • 1 reply
  • 3 have this problem
  • 2973 views
  • Last reply by Isvvc

more options

I'm currently using KDE Plasma on Archlinux and Firefox windows are very laggy when maximized. I have a 4K screen and running Firefox at full 4K causes scrolling to be very choppy and makes YouTube almost unresponsive. If I make the window smaller (about a quarter of the screen or the size of typical 1080p), it speeds up and works normally. I've tried the nightly build, Icecat, and Waterfox and none of them have made any difference.

I use a AMD Radeon R9 Fury X GPU and have the latest version of xf86-video-amdgpu installed and have hardware acceleration enabled in Firefox settings.

EDIT: I've now tried Firefox in Cinnamon Desktop as well as KDE Plasma and they are both equally laggy.

Modified by Isvvc

Chosen solution

Setting all of: layers.acceleration.force-enabled webgl.force-enabled media.hardware-video-decoding.force-enabled browser.tabs.remote.autostart to `true` fixed the issues.

Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

Setting all of: layers.acceleration.force-enabled webgl.force-enabled media.hardware-video-decoding.force-enabled browser.tabs.remote.autostart to `true` fixed the issues.