I have installed boot2docker on Windows 7 and I have noticed that it is incredibly slow. I have tried on several machines with the same result - it takes a while to load and the worst part is the lag between typing and the characters actually appearing on screen is horrible - around 20-30 seconds! This makes boot2docker virtually impossible to use on windows.
I wonder if someone has come accross this problem and can see any solution?
It looks like the problem comes from the SSH client when running boot2docker ssh. This SSH client is searched on the %PATH% and on my system, by default, it was C:\Program Files (x86)\Git. Like you reported, it is dramatically slow.
By the way, if you open a command-line and run directly ssh <boot2docker IP address> to connect to the boot2docker VM, it is also very slow whereas using shell inside the Boot2docker VM itself is fine.
I don't know yet why this SSH client is slow BUT I've replaced it successfully by installing Cygwin (https://www.cygwin.com/) and overloading %PATH%:
C:\> set PATH=C:\PrgFiles\cygwin64\bin;%PATH%
C:\> boot2docker ssh`
No more slowness.