New Patch, Performance/Lag issues

So after the new patch the Warcraft 3 program just seems to run horribly for me.

On the first starting menu I get a stuttering kind of lag, mostly noticeable when I move my cursor around. The performance issue is also noticeable when inside an offline and online game.

Also, prior to reinstalling, alt-tabbing out of WC3 would result in it lagging my computer to the point where it was impossible to control the cursor and even exit the program.

This doesn’t seem to related to any sort of internet connection rather some kind of performance issue…? Anyone else having problems like me? Such a shame since before WC3 worked perfectly.