1 min readUpdated Oct 7, 2026

How To Use FastDL On Your Black Mesa Server

FastDL lets players download custom maps, models, materials and sounds quickly when they join your Black Mesa server, instead of slowly through the game server. It is set up for you, so all you need to do is upload your custom maps.

How Does FastDL Work?

  • When your server starts, custom files in the bms folder, and in add-on folders inside bms/custom, are synced to the fastdl folder.
  • sv_downloadurl is set for you, so players' games know where to download from.
  • New files reach players after the next restart, and files you delete from your server are removed from FastDL on the next start.
  • To see your FastDL address, type sv_downloadurl in the server console.

These folders are synced:

FolderFiles
maps.bsp and .nav, plus their .bz2 copies
materialsAll files
modelsAll files
soundAll files
particles.pcf

Using Your Own Download Server

If you already host your files elsewhere, you can use that instead. See Download Redirect.