As long as you are not using FM GO it can also be very helpful to open the new window via either new window or Go To Related records with a small specfiied size but with a location specified with negative values to open it off the edge of the monitor screen.
In many cases, the MagicKey method can remove the need to change layouts or open windows and this avoids tripping script triggers, having portals or tab controls change state and can make all of the updates part of a single transaction which is better for your data integrity.
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Then I thought, lets use a blank layout to eliminate any slowness caused by elements on a layout.
It does a lot more than that. One of FileMaker's default behaviors is to cache records from the server. If the layout is a Form view, it caches them in 25-record chunks. If it's a List or Table view, it pulls as many as will fit in the window. However, this behavior does not occur if there are no fields from any tables on the layout.
You've done well to discover the performance benefits of using a blank layout. Congratulations.