Intermittently "slow" http proxy over ssh tunnel

view full story

http://serverfault.com – I have an apache virtual host running a reverse proxy accepting connections from the servers IP. To access, I'm running an SSH tunnel from localhost -> server, and pointing my browsers proxy settings at localhost:ssh-tunnel-port. Occasionally (I don't have benchmarks) everything running through the proxy connection is slow. When running Opera, Opera notices and informs me I'm using a slow connection. I have confirmed that the local link to Internet is not the culprit, and this occurs no matter the browser used. I'm not sure if it's the ssh tunnel (I'm not using a fast cipher) or the prox (HowTos)