Hello!
Are you referring to the pop up with “Preparing AssetType (xx)”? This means that assets are loaded asynchronously. The operation may include compiling\building but the result should be cached in the local DDC.
If you are using a World Partition level, the editor might be loading some missing data.
Please share a log and an Insights capture from the editor (default channels is ok) if you think this is something else.
Regards