DeviantArt is unlimited unrestricted in Size and Memory

FantasyAttic is I believe 3000x3000 @ 1.49meg

DreamslayerArts I can't remember the Limits when I was a member(actually I'm still a member just haven't been there for years) but I remember my posts there were 1920x1080 around 1meg and I'm sure I was pushing the limit as I always do

There are several dedicated Fractal Sites I use but those probably aren't relevant to the discussion since it's Fractals only

If you want a Ballpark figure the original Limit of 4000x4000 for sixe was never a problem but 512k was.....go back to 4K x 4K and double or triple the 512k memory limit and I doubt there would be many if any complaints

Remember...No matter where you go there you are