Need a bit more detail. Is it stock? What does "perform better" mean to you? What is your budget? Generally speaking, the first performance upgrades are a free flow air intake, better flowing mufflers, and a tuner module. Depending on the selection of components, you can expect to pay close to $1000. When you hear the term Stage 1 it means the mods listed here. Next would be a cam swap, then a big bore kit. There's a good chance you have one or more of these parts already. Pull the side cover and see if there's a device plugged into the ECM.
After the stage 1 as noted above, look into replacing the rear suspension with some Ohlins and change the fork oil to slightly heavier. It will feel like a different bike.