@andrewilley Legacy File Access in the new Poweramp may be potentially faster and is fast for old Androids (5-10), but for the older Poweramps and/or Androids with legacy file access emulation via SAF (e.g. 11-12-13) it may be slower and may hide file formats not supported by the Android itself.
Sometimes it's quite hard to describe the situation with the file access in Android, as each major release seems to change it radically internally, with various layers of emulation for the "older" APIs. Poweramp SAF scanner should be fast for fast storages anyway. If you have slow or bad storage, it may be slow, esp. on the concurrent access with other apps/system media scanner, freeze on some bad file, or crash player on bad block access.