By latency, I guess you mean its launching speed? I like urxvt for that. I started using it back when I was on a netbook. So much quicker to launch than gnome-t

By latency, I guess you mean its launching speed? I like urxvt for that. I started using it back when I was on a netbook. So much quicker to launch than gnome-terminal or konsole. I didn't even need its daemon functionality which should be even quicker to open up windows. On throughput, I guess you mean its refresh rate? Among its many options, I remember there's one about skipping drawing content when it's coming in faster than urxvt is able to draw it, in order to not slow down the program writing to it. There may be more options that affect the refresh rate.