ssh x forwarding to a mac

I have a recently installed the system and most items seem fine. I am having tremendous problems trying to use opengl based programs (like glxgears) over ssh x11 forwarding on another system on my network. I am able to display a window, but the results are so slow it almost looks like it isn't moving. Other items such as looking at a flash based website are a bit slow but still usable. Using opengl applications is necessary for a project, so I need it to work. Please help

I also should have mentioned, other non-opengl X programs (like xterm) work fine