FWIW, the game uses OpenGL.
@Timmmm: Dev here; your hardware is massive overkill -- something is very wrong if it's not running smoothly on that.
What drivers are you running with?
Can you turn on the perf graph (in debug settings) and note the average `tick` and `render` times?
What scenarios are running slow? We've got some known slow cases in the current AI code if you're playing on an islands map, which we'll be fixing soon.
The Command & Conquer/Red Alert games certainly are a popular choice for remakes, there were atleast two before this written in C++, now this in C# and I recently came across a version of Command & Conquer written in HTML5:
Then we have all the Dune remakes, look like the Westwood RTS games from this era made a strong impact.