Xming Display is very slow when using SSH

I am using SSH and Xming to run Simics simulator and connect to some Linux guest machine. I use x11 Tunneling. The x server seems to be very slow and I need to spend a long time to run a single command on the linux guest machine. Do you have any idea what might cause the problem? Is this the problem of ssh secure shell or the xming?

Thanks.

Why is Xming so slow?

Slow X windows rendering is generally due to high latency between the system running the program sending the stuff to draw (examples: xterm or xeyes) and the device doing the drawing (Examples: X11, cygwin, Xming). Running this over ssh does not introduce noticeable additional lag, in my experience. How do I run PuTTY?

How do you check if Xming is working in Linux?

The Xming server is running if you see the Xming icon in the taskbar. Double-click the public/private key desktop icon to start Pageant.

Traffic compression might solve your problem. Use ssh -C