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The current method for outputting files is considered rather legacy. It can be slow opening files, loading them into memory, then outputting them. With XSendfile (Apache) and X-Accel-Redirect (NGINX) this process can be entirely bypassed to directly call the internally protected files and substantially improve performance.

These however require server setup. So this cannot be enabled by default. Provide a global parameter to toggle this on and include instructions for configuring it. For X-Accel-Redirect a parameter to provide the proectedfiles path will be necessary since it's just an internal alias.