Does opening the World Map window significantly decrease performance?

I don't know if this is an issue only on the Mac client. For that matter, I don't know if it's even an issue on any computers other than mine. When I open the World Map window, my FPS drops way down. If I'm in my skybox, where I usually get 40-60 FPS, opening the world map will take FPS down to around 15. If the "show land for sale" box is unchecked, the FPS will be around 25 FPS.

Opening other dialog boxes, such as Preferences, also affect the FPS, but it's negligible.

Are any of you seeing the same kind of performance problem with the world map window open?

I'm using 1.19.1.4 on a new iMac 2.66GHz with 2GB RAM, OS X 10.5.4.

Yeah, you get two hits, one for the texture loads, and also for all the updates even after they load. If you check or uncheck person, events, etc. checkboxes, you can see the fps rise and fall. The land for sale one is indeed particularly piggy.