Sangband running slow on Leopart

[vnat]

So I just downloaded and managed to compile the most recent beta version from Joshua's page, on Leopard. However, whenever I "run", the window seems to insist on refreshing my character every single space -- resulting on running being much slower than I remember. It had been a while since I had last played, but I had played on Leon Marrick's official 1.0.0 on Tiger and I don't remember that problem happening. I tried that version just now on Leopard for comparison, and I seem to be having that issue. My computer is a MacBook pro from about a year ago, so it shouldn't be an issue of slow hardware...

As far as I can tell, I set fresh_after to "no". Any ideas how I can get the refresh back to the behavior on Tiger (where I only had a refresh when my running got "disturbed")?

Thanks!