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Caching tag information allows to significantly increase in performance when processing tracks (reading tags and duration). The use of the cache will decrease the time needed to generate a playlist, add sweepers and handle any other tasks that involve tag reading and/or determining track duration. It also significantly increases performance when audio tracks are stored on a network drive (e.g. NAS) as it's not needed to read files over the network to get their tags and duration.
To enable tag cache: open General tab in settings: check the "Cache file tags" checkbox. Click OK. RadioBOSS must be restarted to activate caching.
To further improve performance, switch additional information storage to "Database (SQLite)". Please see pros and cons for "Storing information in SQLite database".