Schematics are now loaded asynchronously after startup.
This should usually take only a few seconds if you don't have thousands of schematics.
When you attempt to load schematics before the loading is finished, you will receive a warning.
This change has also a breaking api change, but since I am not aware of any official add ons others than grid selector, I don't expect much breakage. Make sure to grab the latest grid selector version, since that one actually did break.