PhpStorm 2017.1: Unused import inspection is extremely slow

I updated PhpStorm to 2017.1 yesterday. I noticed PhpStorm was using a lot of CPU and my inspections never appeared to finish.

After checking the release notes I noticed some changes in the "unused import" inspection. So I tried disabling that specific inspection, after which PhpStorm was quick again, CPU usage went way down and inspections finished almost instantly.

Please fix this, I really like this inspection so it's a shame if I have to keep it disabled :P