[BUG] Unnecessary reads the entire file on interlace scanning

[Selur]

scan is super slow even if I set the percentage to 1%.

If you set it to 1% Hybrid should scan 1% of the file spread over the whole file.
Have you looked at "Crop/Resize->Misc->Advanced Auto Crop Options" ?
There you probably want to limit the 'sections to scan' and may be even use 'Classic scan'

Cu Selur