I'm running Icewind dale and purchased the module for my players. I keep having loading issues for certain maps. the main thing they have in common is: 1) They are maps I built in outside the module. 2) They have Dynamic lighting turned on. When I'm not hosting the session there has been no issues. However, during the session my computer starts lagging like crazy. I checked if it was my hardware or my software and even replaced a few parts, most notably the disk drive to make it run smoother. I'm using an older model that I salvaged from my work, but the software is up to date and everything should be in working order.