CPU and Graphics card workload

[sportster]

When playing games I notice that the workload for CPU at about 50% and graphics card is about
12%, workload seem a bit low on graphics card, is this normal ? Or I can increase workload
for graphics card ? I don't have problem running games and, pcsx2 setting is default, and 
i'm using opengl hardware mode.

Oh I also notice that there are mild popping sound during gameplay, is this normal ? 
My computer spec at below. Soungd setting is directsound. Thanks.

[RetroBoii]

Try increasing the internal resolution in the GSdx Settings. You know your GPU limits when you start running into slow downs and micro stutters.

You should use the Recommended XAudio 2 instead of DirectSound.