Bandwidth limiting in Yosemite
You can use Network Link Conditioner.



You will want to ignore the testing settings. Make a Custom Profile and set to have no packets dropped and no delay. Start with uplink and downlink at 2.45 Mbps each and see if you need lower limits to prevent disconnects.



It is a free download in Xcode (go to Xcode → Open Developer Tool → More Developer Tools… and download the Hardware IO Tools for Xcode).