Some explainations and tips on how to speed up BoA, for whose who have a low to medium spec.
A bit of explainations first: The BoA map is huge, with 876 regions drawn by hand. On computers with 512 mb RAM or lower, they dont fit all in memory, so BoA use a caching technique: it means that only a part of all regions are in memory at a given time.
This means that when you first scroll on a new area, or if you unzoom the map, your video and general RAM get a massive amount of bitmaps. This is the cause for the occasional lag (cursor lag or scrolling lag) you can get at these times.
Some tips now:
System tab be sure to have these options checked:
Textures init
Allow High Mem
Region pre-caching should be disabled, unless you have a fast hard drive with at least 512 mb of RAM.
Defragment the hard drive where BoA is running. Can significatively increase the performance.
If this is not sufficient, when you arrive in the game, scroll a bit around the starting area, without dezooming, so that the regions are loaded.
Playing with a Filter ON ask for more CPU power.
What will do the most good would be to have 1 gb of RAM, memory stick are rather cheap these days (no obligation though, the tips above should be sufficient!).
Thats been said, even a low-end computer should be able to scroll smoothly on regions previously accessed. If you have still a lag, then check if your video driver is up to date, a old driver can significatively hampers the game speed.