When I set Render distance to 32 or anything above 16 really. My singleplayer worlds either dont load further than 16 at all or renders further chunks really slowly and in really weird pattern. like in those pictures. I dont think that my computer is to slow to load them normally because problem is not only speed but like said way them loads. and fps was really ok. its only was 23 atm i took screenshot it was about the same as in 1st snapshot.
First screenshot is 16 chunks distance and Second one is set at 32.