iTerm2 has a new drawing engine that uses Metal 2. For many users, this will significantly improve performance.
The Metal renderer is available in version 3.2.0.
The new renderer is not available for some configurations:
It is also temporarily disabled under certain conditions:
Most of these restrictions will be relaxed when macOS Mojave comes out.
Support me at https://www.patreon.com/gnachman 😁
If you have issues, please see below:
You can disable it in Prefs > General > GPU Rendering.
To see if it's working, or find out why it isn't enabled, select Help > GPU Renderer Availability.
Note that recorded stats are erased when iTerm2 becomes active, so the only drawing that's timed is between when iTerm2 became active and when you copied the stats out.
Please let me know if you have any problems.