Thanks for the advice, Craig. The files aren't opened individually, as in use xyz in 0 order abc, etc, but they are all set up in the Data Environment, with a complicated set of links between them. The files aren't huuuuge, with the larges having 65k records, and the others ranging down to just a few. There are 24 files, and it can take up to 15 or 20 seconds to load up...