Operating system: Void Linux
Graphics card: Galaxy Nvidia GT 430 1GB (GL 4.6 supported by driver 390.116)
Broken: (public download) 2.80 (sub 75) branch: master, commit date: 2019-7-29 14:47, hash f6cb5f54494e, type: Release
Short description of error
0.5FPS in all windows
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
1: start Blender 2.8.0
2: configure preferences and set Anti-aliasing to single pass (disabling doesn't affect anything)
3: set texture management to GLSL
4: do whatever, even the preferences window displays at this framerate.
step 2 boosted the FPS from 1.5 to 0.5
step 3 doesn't seem to have done anything
my card can handle minor anti-aliasing, in fact I'm even using it in 2.79b at more than 50FPS with the default scene
my guess is poor frame-loop optimization, which I'm rather disappointed would make it into a release.