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[GregWS]

I'm sure it's there, but I found it totally unnoticeable while playing An Untitled Story.  So yeah, minimal.

[Matt Thorson]

And a lot was happening on room switch in An Untitled Story.

The most expensive things off the top of my head:

• Removing from video memory the background/foreground images for the previous room.
• Loading into video memory the background/foreground images for the new room (two 630x480 PNG files).
• Updating the map (accessing and writing to a ds_grid structure).
• Clearing particle systems.
• Miscellaneous room-specific code (initializing weather effects and what-have-you).

So yeah.  In general don't worry about it.

(Ugh, thinking about An Untitled Story makes me feel guilty for all the tiny memory leaks.  Should go back and fix those some day)

[Graham Lexie]

For large rooms you could check the player's position in the room when transitioning, to see by how much you need to offset the room's coordinates.
Say, if a standard room were 2000x1500 pixels, something like:
room_x += floor(player.x/2000)
room_y += floor(player.y/1500)
(I've no idea if this code is quite right since I don't know Game Maker)