I have update my android studio from version 4.0 to the new version 4.1 in windows10 but i have same problems:
Android Studio is very slow to detect layouts, errors …
Android Studio can’t read some plugin like Butterknife.
Android Studio is slow in building and installing apk in devises.

I try to File > Invalidate cashes/Restart, but i have the same problem.

Source: Android Questions