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EEVEE viewport on Catalina 10.15.1 with Radeon 5700 is very slow and poor performance
Open, Needs Triage by DeveloperPublic


System Information
Operating system: Catalina 10.15.1
Graphics card: RX 5700 XT

Blender Version
Broken: 2.81a
Broken: 2.81.16 , 2.82 Alpha (from November 29/ buildbot)
Worked: (optional) 2.81 on windows 10
Worked: 2.80.75 on Catalina 10.15.1

Short description of error
Despite the solved error in T71147 the EEVEE viewport performance (Material Preview, Render) are very slow.
Test scene:
You can't manipulate by mouse (pan, zoom... very-very slow).

On the same Mac under Windows 10 partition everything works good without performance degradation.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Try with this demo-file:



Event Timeline

@Stanislav (SK) can you check if it is the same issue as T71398 or T71325 and if yes close this report ?

@Stanislav (SK) can you check if it is the same issue as T71398 or T71325 and if yes close this report ?

I supposed that it similar problem but not the same (in the term of identical).


  1. Open blend file
  2. Switch viewport to "Rendered"
  3. Notice performance is normal
  4. ... some operation... -> performance drops drastically


  1. Open Blend file
  2. Render EEVEE mode render times at (250ms) create a sluggish viewport


  1. Open Blend file (any kind of demo EEVEE files from official Blender site)
  2. Material Preview Mode in EEVVEE
  3. Boom... immediately sluggish viewport

I think my problem for 90% is similar to T71398.

By the way, my OpenGL specs:
renderer: 'AMD Radeon RX 5700 XT OpenGL Engine'
vendor: 'ATI Technologies Inc.'
version: '4.1 ATI-3.2.24'

Still the have a problem with latest 2.82 nightly build (from 3 december):
Slow performance of EEVEE viewport with some ghost:

Problem still exist in 2.81a

Btw, 2.80.75 works pretty well without viewport eevee lag in Material & Render mode!

Stanislav (SK) updated the task description. (Show Details)

What resolution is your display? also can you turn off.. AO/BLOOM/Screen reflections? and test one by one with for example introduce performance slowdown?

Monitor resolution is 2k.

Viewport eevee lags even with AO/BLOOM/Screen reflections off.

2.80.75 still work without any changes and eevee lags.