Matthias1992, calm down, and Calc84maniac, isn't it more like 1.333x faster than the TI-84+SE? The TI-84+SE is 15 MHz.
Nope, because instructions on eZ80 take less clock cycles than on Z80. It's generally a 1 to 4 ratio. So eZ80 at 20MHz has around the performance of a Z80 at 80MHz.