Crippling Performance of Format conversion RGB8 to RGBA8 for large png (20'000x7000)

[Erfan-Ahmadi]

Description

Crippling Performance of Format conversion RGB8 to RGBA8 for large png (20'000x7000)
most probably due to encode/decode pixels in image filters used by IUtilities -> ImageRegionIterator -> performIntermediateCopy

Solution proposal

Just measure performance and do some profiling first to find what causes the issue, then solution finding will be easier.

Additional context

internal discord chat