Emu 0202 usb v Tascam us 2×2 usb – Hosts & Applications (Sequencers, DAWs, Audio Editors, etc.) Forum

Hi there i can`t get my head around why my Emu 0202 usb driver US-1-40-00 Beta out performs the Tascam us 2×2 usb Driver and Settings Panel v4.00 .i am on a pc desktop windows 7 64 bit 8gb ram . if i have a very small project open in cubase 9.5 the Tascam is ok but once the project gets bigger it starts popping and is unuasable ,i have it set at max buffer size but no joy.
Where as the Emu 0202 handles any project any size with no problem even at 10ms buffer size. the tascam has a power inlet even though it is supposed to be powered by the usb but i dont have a dedicated power supply for it and i was wondering if this might help the tascam,i don`t` know if you can use the power supply and have it also powered by the usb at the same time. thanks