Poor graphics on addon scenery...

[stulew99]

Can anybody help me with a slight problem??
I have a reasonable setup....pentium4 40GB 1.7 512Mb RAM and a titanium TI4200 GRAPHICS CARD.
I get about15-20 fps on the ground and 45-50fps in the air which I am very pleased with my problem is this...
When I start off from my HUB at EGLL (which I have ADDon scenery) there is a "Heat Haze" effect which shimmers very badly when i look around the airport, this can get so bad that it is hard to determine where the runway is and if there is any traffic nearby. I have tried to adjust the scenery settings but this makes no difference.Could it be the quality of the CD ROM addon that is causing this. Can anybody recommend a good British Airports Disc that i can purchase that maybe would be better for me??
Thanks