For FPS games, lighter is better — sub-60g mice allow faster flicks with less fatigue. For MMOs and productivity, 80-100g can feel more controlled. Most competitive FPS players use mice between 45-65g.

Most competitive gamers use 400-1600 DPI. Higher DPI is not better — it is about finding a sensitivity that gives you precise control. Start at 800 DPI and adjust from there.