. . . I know that such a situation can cause problems (like in Monthlery), and this can be minimized by reducing the drawing distance (?)
There are 2 things at work, making our computers more busy, if the t3 & t4, extra viewing area
is the problem spot. There is first the graphics texture size, which has been reduced by our new engineer.
If you move the detail slider to less detail, this also helps make less of the same work. But draw distance is different - a special program is needed to change it. If it's changed, there will then be a strange gap where the see though area is not seen - unrealistic, but some unseen track would also disappear, and this would help. But there may also be a 3rd, 4th, and a fifth cause for Simming more slowly.
GPL tracks are complicated creatures.