Unless I'm mistaken, all images from disk and XML files from disk are loaded to memory once at login. Map images from disk are not reloaded upon zoning, so additional maps included with mods should only impact initial login times, not zone times. I'm positive about the map images since my MiniMap mod allows me to load any map from disk while in any zone with no disk activity.
However... the map XML file is regenerated in memory to include icon and style references sent by the server each time you zone. Map XML file sizes might have a small impact on load times, but honestly I haven't noticed any. The advanced map file is currently only about 300k larger than the original map file. Regenerating 300k worth of data from memory is negligable.
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