Yeah. I was trying to get in there to world edit the floor to lava (it worked before, but there was less entities then) but it was not physically possible, because I was literally moving a frame every 4 seconds, and it was impossible to do any command at all. No idea why this happened, but I hope it can be fixed
EDIT:
You might also want to de-OP me. Froggy temporarily made me OP because I was the only one out of us two that could physically do anything without Minecraft crashing/freezing, and we thought the /remove command might fix it. I've managed to get back to the place and put lava down, so if you teleport there the lag will stop eventually, but the /remove command didn't work, and there's still entities constantly spawning in mid-air :/
I'll stay on the server overnight and in the morning (mostly AFK) so anyone can TP to me (that can of course)