This is a problem related to my server, which users download .bsp maps intead of .bz2. The fastdl file is in .bz2 format but clients download the .bsp one, then so the download speed is too slow. I'm using two different web servers to make clients download the maps
OpenFastDL (I found this one browsing) and
MediaFire. I don't know that many places to create my own web server for free (or kinda), so I'm using these. On my maps folder, I have all the maps in .bsp format. Sorry for my bad english and poor knowledge about this