Bandwidth issues in Mimo live, but not on my computer.

hey all,

just started using mimo live a few weeks ago. i have a late 2013 27" iMac i5 with 32GB of ram. my upload speed is 20MBPS from my service provider but in mimo i get performance issues. my upload rate is back and forth from .8MBPS-1.6MBPS, not sure whats going on. anyone have any ideas?