Let's face it folks, current chainsaws are built for EPA emissions requirements, not speed and power. These days, they're so choked off that you wonder if they really produce the horsepower advertised on the box.
If you feel that your saw is lagging, which you will, you should first consider modding the muffler. Caution: You may want to wait until the warranty goes bye bye before you try any chainsaw muffler mods.
The whole idea is to reduce exhaust restriction. The first things you should try are: