How to fix Adobe illustrator cc2015 very slow problem

Adobe illustrator cc2015 is fine, but after you use 1-2 times, it becomes slow, very slow, extreme slow.

This issue is always found in Mac, especially some of the Mac with the spec below like me.

I am not a Hardware guy, I have no idea on it, but I know how to fix it, after try and error in changing the preference in ai cc2015.

Screen Shot 2016-04-26 at 8.34.17 PM

Below are the item list I tried, and 100% sure, it does not work. Illusatrator cc2015 still slow, especially open and close file. While I quit the application, 99% the whole mac will freeze and I need a hard reset.

1. delete fonts

2. hold down the Cmd(Ctrl)-Opt(Alt)-Shift keys when restarting AI

3. UNinstall Ai.

So I try to do the below things:

– Stop the GPU option (uncheck it!)

I dont know why, but after i doing that, everything fine now! Illustrator cc2015 is very fast after that, really faster than my

Screen Shot 2016-04-26 at 8.17.07 PM

If your AI, illustrator cc2015 have the same problem, please try this, but after you did it, you will no longer to use the GPU animated zoom. But who cares, speed is the king!