I have found that the issue with font is related to size and bit depth more the machine, I was working on a comp that needed a 1280×14000 pixels layout. I made the mistake of using 16 bit and tried to use text. I had to wait almost five before it would let me type anything. I then made smaller layers and just placed them in to the larger comp. While this is not a solution it is a work around.
Michael Sisko