PNG reader seems to produce custom images for 32 bit translucent images.
These are very inefficient to handle and image creation time is also high.
Unfortunatelly it seems to be the only format to create 32 bit translucent images and
they are used by many apps.
In particular pietheory aplication for FX loads 8 of these images on startup.
Simple experiment proved that we may observe up to 22% startup improvement if we fix this.