Rendering problem on Apple MacBook M4 Pro

Is it only on my personal M4 Pro, or can someone help confirm the error?

Minimal, Reproducible Example (error appears after ~18secs): https://www.oslobalanse.com

Exact Environment Details: MacBook Pro, 14", November 2024. 24GB, macOS is Tahoe 26.6.2

Expected results: A kind of film strip behaviour is expected. The images should glide or pan with constant speed across screen from right to left. Images should halt until fully overlapped on left or right screen edge depending on width of image (if larger or smaller than actual window size). The loop should be continuous.

Actual results (so far only confirmed on Apple M4 Pro): The only visible error is the appearance of huge black spaces when the images disappear (see after approx 18 secs). The speed of movement is also no longer constant. This bad behaviour has so far only been confirmed on Apple M4 Pro.

Console Output: There are no errors visibly shown.

Troubleshooting Steps Taken: I have tried and confirmed the error both on version 26.3 and 26.6. The error has also been confirme on both Safari and in Chrome. I have disabled hardware acceleration on Chrome, but it did not help.

Rendering problem on Apple MacBook M4 Pro
 
 
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