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Opened by Daniel van Vugt@vanvugtContributor3 of 5 tasks completed3/5 tasks

Scrolling the app grid incurs very high CPU usage and stutters

Scrolling the app grid incurs very high CPU usage. On an i7-7700 desktop it uses 47% CPU (compared to 17% to display a maximized glxgears).

I imagine most machines can't scroll the app grid smoothly. It doesn't appear smooth on this machine so I would look at the CPU usage problem first.

Fixes required:

  • Land all the CPU optimizations for cursor movement (mutter#283 (closed) and especially mutter!189 (merged))
  • Eliminate slow JavaScript functions vfunc_pick and vfunc_paint from iconGrid.js (!306 (merged)).
  • Eliminate full screen relayouts during scrolling (clutter_actor_queue_relayout from st-box-layout.c). (fixed, but when?!)
  • Frequency scaling / triple buffering.
  • High frequency input (like mutter!168) can't scroll at all.
Edited by Daniel van Vugt