latency at subscriber end, although bandwidth is good enough

hi,

creating an video/audio chat application, where i have 3-4 subscriber and 1 publisher. Although i have a 5MBPS connection i have a letancy in my session.

this experience is worst when  number of concurren users are more, lots of breaks are in the Live audio/video.

What i identify is the concurrent user is the bottleneck for FMS3.5.7.

is there any setting which avoid the breaks in the live streams?

Please help ! its urgent for us.

thanks