I would appreciate more options (basically, much smaller files) for PNG export.
At the moment my limited testing agrees with this closed thread that Squash’s PNG export creates larger files than the originals. I hope this can be fixed.
I don’t know anything about PNG algorithms, so I have no idea what performance you’d expect from Crush and Zopfli, as used by Squash. But I do know that a utility called ImageAlpha can shrink web PNGs by 80–90% by allowing you to choose the number of colour levels. ImageAlpha uses the
pngnq algorithms, if that makes any difference.
If you could match that performance for PNG it would be wonderful. I guess WebP is the way ahead, but I have a lot of users on old versions of Safari so I’m not ready for WebP quite yet.