How do i reduce lag?

How do i reduce lag?

How do i reduce lag in my map? When i have played about 30 mintutes it begins lagging alot how do i reduce it?

Leak checking.
Download the leak checker in the tools section.
If you're a Mac user, I'd recommend making quick friends with a windows user.
--donut3.5--

It could be too much triggers running at the same time later, or memory leaks.