i have seen this problem with every form of warzone 2100 on many hardware configs, even played on a dual cpu server combined 5ghz cpu time and 4 gig ram, it doesnt really seem your hardware specs make a great deal of difference. tho i have come to some conclusions. the game can only handle so many AI and pathfinding computations per cycle. each cycle can take upto 10 seconds (hardware does have a moderate effect on this). the situation can become quite prominant if one or more AI players have caused a traffic jam in their own bases (guess the computer is working franticly to fix all the pathings).
i have also discovered a few compensating tactics, some of which have been mentioned already either fully or in part.
1) for base defence, keep a vtol squad attached to a strike radar in the base for rapid response
2) very very short paths seem pretty immune to the move order que so teasing your units to their destination click by click can get them there, hopefully in time.
3) keep a squad of cheap vtols handy equiped with thermal AE (area effect) bombs, send these on suicide runs to destroy traffic jams in enemy bases, can relieve a lot of the problems
and finaly ...win faster. a dead AI cant slow down your computer
