Chunks Dont Load On Realms.

I Own 3 Realms and all of them have huge troubles loading chunks. trying to load chunks crashes. When joining my map nearly every time the worlds are completly empty, you can see entities and Items and such.but no Blocks and terrain Render. This is Very upsetting as i pay alot of money for these realms and my money is not being used correctly. So Could u Fix this Bug please as it as this is a major bug in the realms. -lynx