Expectable Performance with MongoClient Queries

My question is more specific for the Swift & Kotlin SDK’s usage for the ‘MongoClient’ APIs (iOS-Swift & Android-Kotlin) - though in general for others is fine too…

Assuming that traditional Realm SDK read & writes are faster than MongoClient, since the Sync Permissions are handled post client-side for traditional read/write w/SDKs. What should we expect for the async call (e.g., ‘findOneDocument()’) extra time to complete such request?
-Trying to know (estimates) lag time or its factor against Realm traditional. My assumption for total time would be similar to the server’s Log time, but I do not know what that lag is nor its comparison to traditional SDK’s read & writes performance.

Thank you in advance!