Skip decompression for .png images and other uncompressed formats

[Pash237]

Skipping decompression for .png images in bafe72c moves image decoding from multiple background threads to the main thread causing frame drops.

Probably need to double-check that it really worth it, or make it configurable.

Time Profiler before:

Time Profiler after:

[kean]

I temporarily reverted this change in v12.7.1.