Try checking trackerd perhaps? It indexes pictures, music, & videos in N900. By default, it does that to many locations under MyDocs & the whole SDcard. The config file is: /home/user/.config/tracker/tracker.cfg There's an app that lets you tweak trackerd as well. kh
# Initial sleep time in seconds (0->1000) InitialSleep=300 # Minimizes memory use at the expense of indexing speed LowMemoryMode=true [Indexing] # Sets the indexing speed (0->20, where 20=slowest speed) Throttle=20