When I generate/load any world previously been in or new world in singleplayer and multiplayer, I get strong flashes on the screen that throw trees, ice, grass blocks, etc. all in a recurring pattern for a long distance.

I expected the world to generate and for me to go on with playing minecraft.

Giant flashes of terrain popped up on my screen. I could break blocks and move but no matter what it would not stop flashing.

Singleplayer:
Generate new world with no certain title
Load world (it took about 10 seconds each time)
Problem occurs
Multiplayer:
Type in server address
Load world (took about three seconds to load each time onto us.mineplex.com)
Problem occurs
Also notable I tried to play a game on the same server shown in the pictures with the problem occuring. The game required a texture pack (I did confirm the texture pack, and the notice to allow the texture pack had no trouble of coming up) which made minecraft on my computer even laggier. The problem seemed to get worse.