I have recently noticed lag whilst playing fs2004.Only when in large airports such as;Heathrow (UK2000 Heathrow Xtreme V2)Frankfurt (Aerosoft Mega Airport Frankfurt)Amsterdam (Aerosoft Mega Airport Amsterdam)I have lots of AI aircraft with very HI-RES textures and models and I'm also running the sim at full graphics settingsI realise that this would be why flight sim tends to lag in the larger airportsHowever, i opened my task manager and ATI CCC to view the stats whilst running the flight sim.My GPU sits at about 60% and CPU at only 25% whilst doing an approach into Heathrow and it lags terribly.I was wondering if there is a way to force flight sim to use more CPU and GPU power to reduce the lagCPU : AMD Phenom II X4 965 3.4GHzGPU : ATI Radeon HD 4870RAM : 6GB

Just measuring GPU and CPU usage in percentage and assuming your lag is the result of the percentage not being at 100 is quite the simplification. Your CPU is a quad core, so it's not very surprising that CPU usage is at 25% in a single core game. Also flight simulator doesn't make use of modern GPU features such as shaders.. Much of the work is done on the CPU, so it's not really surprising that your GPU isn't running at 100%.

Download and try fsaffinity_v2_267238.zip from here. It might help by using 1 core purely for FS and the other cores for services, etc. It seems to help with my E8400.Colin B