A few days ago I installed EECH (GOG edition) onto my laptop (Dell Inspiron 7577), and I expected it to handle the game easily (with a GTX 1060), but I still experienced some graphics lags. A distinct example would be lagging of FLIR view (specifically when panning). In the mission selection screen the mouse pointer may lag a lot. Did you experience similar issues? The OS is Windows 10, maybe there are compatibility issues involved?
Yes, I tried and it went rather unexpectedly - the framerate dropped to around 15. Without the setting it floats around 40 in cockpit view, and surprisingly, around 30 when viewing the map (when selecting a mission). 45 FPS is more or less comfortable, but still, I would expect more from my system. ----------- Update: The game was running in Windows 98/Me compatibility mode, which I disabled and tried enabling TnL again. Now it runs smoothly at 60 FPS.
slow down does happen right after waypoint passed? is it simple route waypoint, or first/last? such possible if it's troops extraction point for example, or recon was just send, but in other situations - does not. maybe you can make savefile right before it happen, so I can test it? sounds like very specific situation.
So since I got my new laptop, I noticed quite a few performance issues, mainly really low FPS.
I've managed to fix it, this is what I did.
I have an AMD Ryzen 5, that has it's own GPU. I also have a Nvidia GTX 1650ti.
So in the Nvidia control panel, I set EECH to use the Nvidia card, as it was selecting the integrated GPU by default.
But I think the thing that made the difference, was changing the cohokum.exe to run using Windows Vista compatibility. It originally was trying to run using Win 98 settings. I tried Windows XP too, but Vista seems to provide the best performance.