Here's a batch file that will resize all the biggest textures at KDFW to 512x512 instead of the default 1024x1024, that should improve the stuttering, because VRAM memory requirements are now 4x less
Unzip the file in the following folder
fs9\fsdreamteam\kdfw\texture
And run the resize.bat program. At the end of the process, you'll see that all the 1MB textures are now about 300K each. If you want to go back to the original hires textures, just reinstall the scenery.