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Blender VSE slow rendering
Open, Needs TriagePublic

Description

System Information
Operating system: Windows 10
Graphics card: Nvidia GTX 1050ti

Blender Version
Broken: 2.80 2018-12-20
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
All videos that I have edited through the blender VSE in the Blender 2.8 beta for 2018-12-20 have had twice the amount of render time as in Blender 2.79b

Exact steps for others to reproduce the error
Change the render engine to cycles, use the hybrid CPU and GPU render option, then render edited video from the default video editing layout.

Details

Type
Bug

Event Timeline

Richard Antalik (ISS) claimed this task.

Is this for preview or render(export) speed?

I was looking for bottleneck of preview speed (files from 2.79) and found, that hiding timeline(sequencer) doubles the max speed.
No code responsible for slowdown was identified however.
Often (not always) when I add timeline back, speed stay at higher rate.

Also new startup file has some color magic set up, so that also impacts performance.

But sure this is our issue, tagging this.

sorry it took this long to respond, i can try to hide the sequencer and see if that works, also do you no how to set the colors back to normal?

ok, i got it, i just created a save file from blender 2.79, if you know a better way though please tell me

Also please look at this thread and check if it applies to your problem.
tl;dr disable V-sync for blender in nvidia control center