[krita] [Bug 445657] New: Loading 250 Frames performance problem and jump back/forward buttons doesn't seem to do ANYTHING

[Hoang Duy Tran]

https://bugs.kde.org/show_bug.cgi?id=445657

            Bug ID: 445657
           Summary: Loading 250 Frames performance problem and jump
                    back/forward buttons doesn't seem to do ANYTHING
           Product: krita
           Version: 5.0.0-beta1
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Animation
          Assignee: krita-bugs-null at kde.org
          Reporter: hoangduytran1960 at gmail.com
  Target Milestone: ---

SUMMARY
Tried to load 250 frames 1080p (1920x1080) of a camera animation (produced in
Blender) to test the loading time, showed that the software has taken too long,
plus trying out 'Jump back' and 'jump forward' buttons doesn't seem to do
ANYTHING.

Generating cache stopped at 99% and just hanging in there, must pressed the
'Cancel' to get out.

STEPS TO REPRODUCE
1. Use Blender (any version from 2.78 onwards) with 250 frames animation of
rotating camera round a cube (this video is possibly can be a tutorial
candidate to guide you to perform such an activity:
https://www.youtube.com/watch?v=1oD3gSX3ICM), save the animation as PNG images,
250 of them, in one location.
2. Use Blender to load the produced frames using Video Editing workspace and
observe how quick all 250 frames can be brought into the software (instantly)
2. Open Krita, with 1920x1080, 300dpi layout,
3. Switch to 'Animation' layout, perform File->Import animation frames and
observe how slow all frames are loaded? Remember to press Cancel at the
'Regenerating cache...' dialog when it stops and hangs at 99%
3. Try to select a frame in the middle (off 0) and press 'Jump Back' and 'Jump
Forward' buttons and notice the playhead doesn't seem to do anything

OBSERVED RESULT
- Slow loading of frames (noticed that the video has already been sped up
almost double)
- 'Jump Back' and 'Jump Forward' buttons doesn't seem to do anything to the
position of the playhead

EXPECTED RESULT
- Loading at LEAST is the same as Blender
- 'Jump Back' should move the playhead to the FIRST FRAME (or a number of
frames configured somewhere)
- 'Jump Forward' should move the playhead to the LAST FRAME (or a number of
frames configured somewhere)

SOFTWARE/OS VERSIONS
macOS: 10.15.7


ADDITIONAL INFORMATION
Screencast of testing procedure and the comparison with Blender loading time
(https://drive.google.com/file/d/1B_FbDsZneshou7Sqo6_RWTLsTS6U4QKY/view?usp=sharing)

Test data: 250 frames in a single zip file:
(https://drive.google.com/file/d/1HwPqMAxeOUea6Mfx1Y_omXLUwcuT5iuK/view?usp=sharing)

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