I'm on my survival world, going through my strip mine, I turn on F5 and boom, a view of every cave system pops on my screen.

This didn't seem too bad, because I know Minecraft has had it's days with accidental cave rendering and such, but on my friends server, this became a huge problem.

I wasn't lagging, this just seems to be a visual glitch.

What i did to do this, was to align my F5 with the roof of my 2x1 strip mine, then walk forward and back.

Once again, could be a visual glitch. That's all I know of.