Hammer Not Compiling Map And Freezing

I am having a problem with Hammer. When I try to compile my map, it will freeze and crash.
It gets stuck on portalflow:

Any ideas what’s wrong?

Its not crashing its just not responding to windows. That is usual. If you are spending too long on it try looking through this guide and optimizing your map.

I literally left it on all night while I was sleeping. Nothing happened.

[editline]22nd December 2011[/editline]

And anything that could be optimized, I had optimized already.

Try using VBCT to compile, that way windows will not freeze the render-status.

Thanks for that, looks handy.