What causes a high var with net_graph 4

first of all, I don’t know what the Var stands for but it is ridiculously high. My server has been crashing for a quite some time. I have spent hours upon hours for days trying to figure out what was causing the crashing and I just now noticed that the var is insanely high. It is up around 12 - 13 with only 4 people on, I have joined other servers to view their var to make sure this is the problem and theirs is usually around 2 - 8 with as many as 30 - 40 people. I would like to know what causes it so I can fix this issue.

It was ulx global ban causing it.