Stop using Chrome..
Sorry to say this, but Chrome has problems on and off.
If you have the auto-update feature on (default i think) then sometimes it updates and suddenly there are crashes, then updates again and it stops, etc..
Chrome causes my 2 macs to slowww down even with 1-3 tab(s) open. My recommendation just switch to Safari and stick with it.
Sure it doesn't have the nice features that Chrome has but it has been running rock solid for me.
With Chrome everything just slowed down and got un-responsive.
So yes, it's not the new Air, it's just Chrome. Some people get it, some people dont. I have no idea why, so i just gave up 🙂.