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kotlinlang

you query `User` on a background thread, post it to the main thread to display, and then attempt to traverse a relation

but you can also fetch all relations in background thread isn't it? i use greendao for years and have no performance problems at all

It has nothing to do with performance (aside from the fact that ORMs will always be fundamentally slower than purpose-built queries), it's that the mechanism to traverse the relation isn't thread confined and lets you navigate it at any point.