Honestly, X forwarding doesn't work that well in my experience, unless you have a very stable connection, with quite a bit of bandwidth (~1Mbps at the very least). I've had more success using xpra for forwarding, as I'm often connecting over Wi-Fi (hostel, campus rooms...).

It's also rather complicated to set-up on the server side (xauth, magic cookie, etc).

waypipe, on the other hand, was a breeze to use, even though it's very young. I tried with Firefox and 500Mbps of upload capacity, it worked fine as long as the window wasn't too large.