I have a computer that runs minecraft max render and max settings at around 250-300. It runs everything smoothly, but then one day as I was opening minecraft and entered a server, only one chunk loaded. I could /fly on that server, so I flew and I noticed that my minecraft only loaded one square. No lag but only 1 chunk. Then when I flew a little, some of the chunks from behind me would be removed, and from the front, more chunks loaded. I tried reinstalling minecraft and doing A + F3 but it doesn't work. I tried using optifine but theres no difference. I tried adding more ram to minecraft but I couldn't. Any help?