Halo map

My game works fine on all other maps except halo, whenever we switch to that map my game lags hard and sometimes crashes, is it something with the map or my computer?

You should probably do a few generic things first. Delete the map, verify the game cache, check the console for any error messages, and see if the map only lags when looking at certain objects.

Some maps are made poorly, but typically they only cause a minor decrease in framerate.

Its like party island when we had it oh god them lags frame rate drops and crashes