Hiver provides Keyboard Shortcuts for the most frequently used actions which could save you a lot of time.
Activate Keyboard shortcuts for yourself
To activate Keyboard Shortcuts on your user account,
1. Click on the yellow 'gear' icon on your Gmail
2. Click on 'My Settings'
3. Click on 'Basic Settings'
4. Find the option 'Keyboard Shortcuts' and enable it
List of the available Keyboard shortcuts
You can find the list of available Keyboard shortcuts here