[kdenlive] [Bug 507630] New: [Perf] Viewport animation on Title Clip with large amounts of text extremely slow to play and render

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https://bugs.kde.org/show_bug.cgi?id=507630

            Bug ID: 507630
           Summary: [Perf] Viewport animation on Title Clip with large
                    amounts of text extremely slow to play and render
    Classification: Applications
           Product: kdenlive
      Version First 25.07.90
       Reported In:
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Title Clips & Subtitles
          Assignee: jb at kdenlive.org
          Reporter: rich at racitup.com
  Target Milestone: ---

SUMMARY
Using large amounts of text with the viewport animation for scrolling text
causes performance issue. Rendering is extremely slow. On a recent project
render fell to 0fps (1000 frames in 4 hours)

STEPS TO REPRODUCE
1. New Project
2. Add an image to a video track for 20 sec
3. Add a Title Clip to another video track overlapping the image for 10sec with
the following settings:
- One A4 side of text (300 words)
- Font: phosphate, size 42, colour solid black
- Outline: 13 white
- Viewport animation: top to bottom

4. Try playback or render - extremely slow.

OBSERVED RESULT
Extremely slow - with animation
Normal - without animation

EXPECTED RESULT
Normal both times

SOFTWARE/OS VERSIONS
macOS: 12.7.6

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