Illustrator CC2018 slow performance/lag on macOS 10.14.6

I'm using Illustrator past 2-3 years regularly for designing.
Few days back my Illustrator 2015 started acting weird like not displaying anything on the dialog box or the dropdowns, it went blank (as shown in photos)

So, I uninstalled and installed the 2018 version and it STILL doing the same thing, moreover it starts freezing my mac and I have to log out or shut down and start again.
I used to think it's happening because I use Blend or 3D options but it happens in simple things like using type text option!

Please help me, I need to work!

Edited: I have MacBook Air (13-inch, 2017), Processor: 1.8 GHz Intel Core i5 with 8 GB 1600 MHz DDR3 and Intel HD Graphics 6000 1536 MB
OS: 10.14.6

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