Affected Versions of X-Plane: 8.64, 9.00 Affected Operating Systems: Mac OS X, Windows, Linux Affected Video Cards: GeForce FX series (GeForce FX5200-5950)
Description: framerate is significantly slower when pixel shaders are in use.
X-Plane 8: pixel shaders are engaged when “high detailed world” check-box is checked in the rendering settings. X-Plane 9: pixel shaders are engaged when “use pixel shaders” are checked in the rendering settings.
This is a known limitation with the GeForce FX series of video cards; their performance is significantly faster when pixel shaders are not used. This is not an issue with the newer GeForce cards (6, 7 and 8 series).