I'm actually not quite sure about this...
These are the official Blizzard patch notes for SC2 after retail release:
http://us.launcher.battle.net/patchn...2&locale=en-US
There is no official mention of a fix being rolled out for that specific issue.
However, there is mention of a fix being rolled out in a beta patch earlier this year. However, I think this is probably irrelevant since a lot of people were experiencing this problem post-beta anyways. For reference, here are the cached patch notes for the beta:
http://webcache.googleusercontent.co...&ct=clnk&gl=ca
Just to be on the safe side, you can check if your game is still affected by this issue:
1.) Open SC2 and idle in any menu you like.
2.) Press Control + Alt + F. A number should appear at the top left side of your screen.
3.) If this number is very high (something like > 60???), then you definitely know that your computer is still affected. Just for comparison, I am always well under 30 after applying the fix outlined in the article that I linked in that earlier post.