[Freeswitch-users] Sound files from cache

I am using "playback" to play native sound file (<action application="playback" data="/tmp/hello"/>) My question is when it plays the file does it read file every time from the disk? or there is some way to "Load at the startup" and play directly from memory. I also saw the "mod_http_cache" but not sure if I should use it (I am unable to understand in what scenario it will be logical to use it)