1- Did the system work fine before or are you experiencing this issue since the first day that you have the computer?
2- If this worked fine before at any moment, were there any recent hardware or software changes that might relate to the point when the issue started? (for instance, Windows®, driver, or game updates?)
3- Just to make sure, is this only happening with the "Command & Conquer Remastered" game? Are other games performing without issues?
4- Are you currently running a clean/fresh install of the operating system (OS) after testing by modifying the Windows* Registry?