I recently started to hack around Monticello due to very low response times when having a huge package cache. Now interestingly the FilePlugin primitives for listing files are horrible! Example: ----------------------------------------------------------- MC often requests a list of all mzc's cached locally: (FileDirectory default / 'package-cache') entries In my case there are 4300 mczs in the shared package-cache timeToRun yields a nightmarish 2050ms for this, further investigation leads to the fact that most of the time is spent in the file primitive! Now thats some 2ms for a single directory entry! [Just as a side note, ruby1.8 does the same job in 10ms :D] ----------------------------------------------------------- primLookupEntryIn: fullPath index: index <primitive: 'primitiveDirectoryLookup' module: 'FilePlugin'> ----------------------------------------------------------- I think we should definitely add another primitive which directly lists the file under a certain path. Of course this will break compatibility with existing code, but I think the current approach does not scale... best cami