Paths are populated after the query executes and a response is received. A separate query is then executed for each path specified for population. After a response for each query has also been returned, the results are passed to the callback.
This implies at least two queries in series, but if you populate more than one property then those populates will run in parallel (after the initial query).
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so when using virtual as usual when we use populate its should populate our other shcema. but will not affect on the performance? like that?
Unfortunately, these must be chained to your .find() queries and run in series.
mongoosejs.com/docs/api.html#query...
This implies at least two queries in series, but if you populate more than one property then those populates will run in parallel (after the initial query).