NVIDIA GeForce GT 630
Intel Core i3-2120
Broken: I would say so... 2.8 for sure. probably even 2.7
Short description of error
UI refresh rate varies a lot depending on open panels, even with constant load
Exact steps for others to reproduce the error
- Open blender VSE, load video, image or generate one.
- Make it short, ~200 frames, so you can be sure it will fit the cache.
- Play it once, so it gets cached.
- Open various panels and tabs, and watch FPS reading.
This should be reproducible, because some panels will affect even playing empty timeline.
I created a video demonstration of this. It is a debug build, so effect is more noticeable, then in release version.
First part of video presents problem as I described.
In the second part I played different footage, trying to demonstrate similar problem:
Video plays at 30FPS, Set framerate is 60.
When I hide timeline(sequencer), playback speed jumps to 60.
When I create new timeline, playback speed stays at 60FPS, until it reaches efra then jumps to 30 again.
Unfortunately I wasn't able to capture second case properly, because with OBS I couldn't even achieve stable 60FPS.
In practice it seems that absolute maximum refresh rate of VSE is only 60FPS. Exactly.
Also notice, that often framerate drops are suspiciously exact - 20.00 or 30.00
Video in question: