Halo 2 > Halo 3 > Halo 3 ODST > Halo Reach > Halo CE
Based on campaigns.
So my computer is pretty crap, but it is decent enough to run Halo Combat Evolved smoothy. However, there are a few parts during the campaign where the game starts lagging, usually when there are a lot of enemies or action. Such parts include the first group of marines on Halo, the big battle before entering the ship on Truth and Reconciliation, the beach storm on Silent Cartographer and first stepping outside on Assault on the Control Room.
Apart from that it runs perfectly smoothly. However I am wondering if there is anything I can do to stop these parts from lagging? Or is my computer just not good enough to run these parts smoothly?