@Loki
Both.
So day one and day two (possibly day three?) after update I enabled autosave after discovering the manual save was gone.
Play sessions lost data that should have had quite a few save points. Some was stuff that was partially complete so as if the save did work but not the subsequent auto save after.
Now I have auto save disabled and the flower still shows up but it is not actually saving... I saved and exited and then tested by playing until the flower appeared and stopped (testing design concepts for a doorway as the test confirmation subject) dashboarded instead of save and exit the doorways built were not retained... mind you this was with auto save disabled so they were not supposed to be saved.
The auto save sometimes saved the data but then I also lost at least an hour of work on a build expansion those first couple of days. I am not too butt hurt over the loss as I was on the fence about continuing in a legacy world.
Furthermore I haven't spent a great amount of testing regarding whether it is isolated to legacy vs. new large world or not. That is a possibility that you yourself probably will be unable to test given you fired up the console post update. (This actually just occurred to me, because the non working auto saves were isolated to all legacy worlds, I abandoned auto save after these incidents and then decided to kill time prepping a new large world for hardmode using only save and exit while the kinks got sorted out)
I can not commit any time to guarantee testing on that theory for the next two weeks though in reflection I personally have not utilized auto save in any of the new large world's created post update.
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@ED209
Nope. Even excluding the time spent in multiplayer (not in ice biome until the end but he was using his solar eruption in my world for the duration of cultist battle no where near ice and then the pillar was in the ice biome... lag from start to finish. In his world no where near ice at all... like half a large legacy map away from the ice extreme lag)
In my multiple world's and tests... two large legacy and one large post update no where near ice biomes it is still the extreme lag.
It's actually kind of fun because the enemies sometimes get just the as stuck as I am... the sword is still swinging quickly but the enemies drops and my toon looks like they are seizing... I let enemies jump at me then see how long it takes them to hit me while aim down so the weapon can not hit them... also I can see the drops in slow motion so I can scan if it's something I wanna grab or leave be when they are behind me.