SQL online back up with 10d

I have read many posts about decreased performance with BU 10d post SP2 on Windows 2003 server.  is the bottom line that i will need to deal with slow back ups of these servers (~300-500MB/min throughput) while the rest of my back up servers -using 11 or 12 are getting 2500 - 3300MB/min throughput? or is there a fix -i would even consider an unsupported fix at this point, that will help?