Or just use xterm. It's blazing fast and even supports GPU acceleration if you are using a video driver that uses Xorg's GLAMOR acceleration framework. It has close to the lowest latency of any X terminal, as well. It has a reputation for being slow because it actually commits each character or terminal command to the display, you know, like a real terminal would. If you set the fastScroll X resource to true, xterm will behave like other terminal emulators and enable a speed hack that makes it skip display updates.