Buy a better computer is my reccomendation because if you are unable to get full speed on pcsx2 then is almost imposible to get full speed on the arcade version PCSX2 system requirements for low end All hacks to maximum Dual core at 3.4 GHZ intel 3 Gb of ram DDR3 GPU any type at least 128 Mb
Mame requirements tekken tag tournament Dual Core Intel at 3.8 Ghz 2 Gb of ram DDR Gpu not used ? (blame software rasterizer a gpu optimization will work better and make the games use less ram and less cpu) So as you see if you cant get the minimum to run tekken tag tournament on pcsx2 then your chances of running it on mame are less likely. As you see mame and pcsx2 are kinda similar they dont use gpu properly they mostly need a powerfull cpu so invest money on a better cpu instead of buying a pcb (is cheaper an amd 4 cores at 3.6 Ghz then a PCB) and the reason i mention Intel is because both emulators are optimized for intel not for gaming PC (mostly all amd) One advice dont believe the youtube videos info because most are fake information like the so claimed pcsx2 on low end because thats imposible to achieve.