Well, issue solved. It seems that moonlight was bringing full desktop streaming to rpi, giving those lags. It was too fast so i didn't noticed. Solved by using a .bat file on Windows to force autoplay and no gui:
@ECHO OFF
"C:\Program Files (x86)\PCSX2 1.4.0\pcsx2.exe" "D:\Jogos\PS2\gta_vicecity_ps2.iso" --nogui --fullscreen
At the Geforce Experience Tool, click at configurations(little cog at upper right corner), SHIELD menu, Add(Adicionar, Brazilian Portuguese) and point to this bat file and you are good to go. In my case, i have just edited the pcsx2 gamestream entry.
0_1503714691676_shield.PNG
Now, games are running smooth.