This isn't an issue with this mod in that I don't experience this and can't recreate it myself, so the issue is on your end. I would suggest trying out other EaW mods and seeing if the issue is there too, checking the file integrity through Steam and checking your ingame graphics settings. Turn the sliders up and down, check and uncheck the boxes in there, change the resolution ect.

Another thing you can do is lock the game to using only 2 physical CPU cores in task manager. If none of that works you can use a hardware monitoring tool to see exactly what your CPU, GPU and RAM are doing while the game is running. Issues with lag in EaW are usually CPU related.