Slightly oddly (until you think about how much of it there is on a battlefield) setting grass/vegetation detail to lowest setting may have the biggest positive effect on battle map performance. New Campaign Map The earliest period any Total War game has depicted, Wrath of Sparta’s campaign map is a vivid and detailed representation of the Greek world in 432 BC featuring 22 provinces across 78 regions, covering the Greek mainland, islands and the Ionian coast.The map brings 12 new Wonders to light, including the Ruins of Troy, the Temple of Zeus and the Royal Tombs of Makedon. When I went up to 'large' unit size, I had to tune most visuals down or off to get a good game, especially when battles were between 2 at- or near-full strength armies. The strategy map commands for cities & unit moves on the strategy map were always fine. The game was developed by The Creative Assembly and released for Windows on September 22, 2004. Similar to Hussarknight, I started playing the game on a 2.6 gHz P4 with 512 mB SDRAM & an nVidia 5200Fx with 128 mB memory. Rome: Total War (often abbreviated to RTW or Rome) is a critically acclaimed strategy game composed of both turn-based strategy and real-time tactics, in which the player fights historical and fictitious battles set during late Roman Republic and early Roman Empire (270 BCAD 14). IIRC, most of us felt by the time that RTW had been out a few months that you really needed about a 2 gHz CPU for a fairly satisfactory game experience.

I think your biggest problem is the CPU itself.

Rome 2 campaign map lag