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Movie clip playback FPS is reduced in 3DView.
Confirmed, NormalPublic


System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59

Blender Version
Broken: version: 2.83 (sub 9), branch: master, commit date: 2020-03-15 22:43, hash: rBf06a6e92bc5e
Worked: ~2.79

Short description of error
When a movie clip is read into a background image and displayed on a 3D view, the FPS decreases in a sequence of 2K or more.Even in full HD, FPS decreases a little.
There is no problem if you play only with the movie clip editor.
Regardless of file format or file size, resolution seems to be involved.
There was no problem if the resolution was dropped to 2k or less.
Even if the sequence is full HD, the FPS will drop slightly. There is no problem if it is less than Full HD.

Below is a comparison with 2.79 under the same conditions.



Exact steps for others to reproduce the error

  1. Open file
  2. Play animation (and make sure it is not able to play at 1200FPS)
  3. In properties editor, toggle Show Background Image

FPS rate will drop significantly

Event Timeline

Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Tue, Mar 17, 7:43 PM

@K.nao (nao)

If the sequence data read on the Movie clip editor is larger than around 1 frame 250KB

I am not sure if I understand you correctly
Are you trying to load sequence of files?
Is file size supposed to be greater than 250kB?
What is format of your files(jpeg/png/...) ?
Can you share at least one image you used? If you can test if this happens with sequence of copies of same file.
Can you share .blend file, so we can see your settings are OK?

The same is true on 3Dview.(24FPS>5~8FPS)

I don't understand how you compared performance of movie clip editor to 3D viewport, these are very different editors.

K.nao (nao) renamed this task from FPS decreases when playing back large file size file data read by Movie clip. to Movie clip playback FPS is reduced in 3DView..Wed, Mar 18, 2:32 PM
K.nao (nao) updated the task description. (Show Details)

Sorry.I re-examined it under multiple conditions and rewrote the problem.

Richard Antalik (ISS) changed the task status from Needs Information from User to Confirmed.Tue, Mar 24, 9:32 PM
Richard Antalik (ISS) updated the task description. (Show Details)