The solution for my online chat/text lags was just switching from rasteriser Open GL v2 to Direct 3D v2 (in GEM+).
With Direct 3D v2 I didn`t have any chat/text lags at my last online race and the graphics are also nicer. I have no more zigzag lines in the distance with the same graphics settings (see screens).
With Direct 3D v2 the GPL menu text is a bit blurry and buttons can flicker and in the replay menu buttons can disappear, but I can live with that.
As you notice on the screens attached in Open GL v2 the font of the Pribluda text display is different. In Direct 3D v2 the font is smaller and clearer.
It seems like Direct 3D v2 works better with modern graphics card drivers in-game with text and graphics display.
But Direct 3D v2 it is too hard on FPS.
Therefore I do not recommend Direct 3D v2.
Edit 1: With Direct 3D v2 you may most likely have very low FPS. Try a full AI race with 1969 F1 Extra Mod (or 1967 Sports Cars Extra Mod -> see last screenshot) at Spa67 and start from the back of the grid. If you have low FPS try to reduce your graphics settings in Nvidia Profile Inspector (like lower Antialiasing - Setting value, lower Antialiasing - Transparency Supersampling value). You can set different graphics settings individually for each gplmod.exe. If that does not work you may have to use Open GL v2 instead of DirecT 3D v2 for that mod (and track).
Edit 2: OpenGL v2 still works best on my system (NVIDIA GeForce GTX 970 graphics card). With Direct3D v2 I have massive FPS hits (see last screenshot).
Edited by Stefan Roess, Jun 26 2020 - 06:19 PM.