I have 1-100 sound files (mp3) and wants to play these files in loop from 1 to 100 to more than 250 concurrent users. 

Currently these sound files have format.

Codec: MPEG audio layer 1/2/3 (mpga)

Channels: Stereo

Sample Rate: 22050 Hz

Bitrate: 64 kb/s

While playing these files I see in freeswitch log.

I want my freeswitch to have minimum load while playing these files (located on freeswitch server).

I which file format I must convert these files to have my freeswitch  with  minimum load.

Your Guys opinion is much appreciated.

Thanks