i had a fully featured FPS with crawling/ladder climbing, ai, shooting, collision, inventory, quests/task, pickup/powerup system and shaders running with 20-30 fps on A6 WDL. It was a indoors horror shooter, kind of like l4d + resident evil 3 on fps. Damn, i had aspiration at the time.

my system was radeon x200m, 1gb ram, centrino processor.

It's either something wrong with your code and/or drivers/system setup.

When something like this happens, think about games like SuperCan, there is alot of enemies and actions with all that pretty shaders, and it works fine. This means problem is on your side not on the engine's. An engine does not slow down with a few trees and bushes in a small level for no reason.