The problem is the game bounces back and forth from virtual to physical RAM for graphics pulls. That is most noticeable when there is a lot going on with large numbers of personnel and machines, load screens and movie excerpts. For some reason, these newer OS types like 8-windows 10 don't like that sort thing and causes many rendering problems. There is a patch however that will fix the issue. I have provided a patch download link below.
Graphics Patch LINK
Do things in this order>
1 download the link and extract the file.
2 Make a new empty folder on your desktop and place the extracted file in there
3 Locate yuri's game EXE file/ AKA application. It will be under C:\Program Files (x86)\Origin Games\Command and Conquer Red Alert II The file is called gamemd The file is 4,704 KB
4 Right click on it and copy. You will then want to paste that file in the folder with the patch you created earlier on your desktop in step 2.
5 Now you will want to run the patch file and activate the patch. Its so quick and easy it is self explainable.
6 Once you have done that, you will now right click on the same EXE file and copy it once more.
7 Re-paste that file back where you got it from in step 3
8 Your all done. Things should now run really fast and smooth. No more freeze ups!
9 This can be done with both Yuri's Revenge EXE (gamemd) and you can also follow the exact same steps with EXE (game) to patch RED ALERT 2 as well.