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Showing developer posts only. Show all posts in this thread.
Here are a few things.
1. Make sure you have the latest drivers.
2. Turn down the graphics acceleration, you can experiment with this setting to see which one works.
3. Lower your refresh rate.

See this thread for reference, it also refrences another thread from within that one that may be helpful as well.
http://www.europa-universalis.com/forum/showthread.php?threadid=65168

Good luck let me know what worked.
 
Glad it worked out for you.

Just remember to turn it back up if you play a FPS. ;)
 
The problem is you need to lower the refresh rate for HOI. See the second post in this thread (first one by me) for things to try.
 
Well that was the first suggestion. :)

Happy hunting!