Mathews have always exagerated the speed of their bows. They are good bows nonetheless.

Bow companies test the speed of their bows at IBO which is70#, 30" draw, 350 grain arrow. As a thumb rule, you'll lose 8-10 fps for each inch you reduce the draw length. Also, big speed robbers are the following: Peep sights with rubber hose attachments you'll lose 10-15 fps with one of these. String loop, 3-5 fps, metalstring loop, 12-18 fps,Stand alone peeps like the metapeep 3-5 fps (you'll gain in veryrare occasion if you don't have speed nocks on close to the cam(s)).String silencers, 1-2 fps for each one added (the closer to the cams = less speed reduction but also less noise reduction). A simple brass nock in the center string location will cost youabout 1 fps each (brass nocks close to the cam can actually increase speed by a few fps). You will also gain about 2 fps on averagefor each pound of pullyou add. On average, you'll also lose about4-5 fps for every 10 grains ofstring or arrow weight you add over 350 grains.

I'll use myPSE Dream Seasonas an example. PSE rates it at 340 fps at IBO. I have 31"draw andI have 73#'s of pull= 8fps extra for draw and 6 fps extra for pull bringingit to 352 fps IBO. I have a 391 grain arrow, two nocks, one meta peep whcih adds about 50 grains extraover the IBO weight which according to this formula, my bow should be getting about 332 fps. My bow is actually getting 327 fps so it's right there with this formula. This is a good way to figure out if you bow is performing as it should be.

Other things to be aware ofare aftermarket cable slides, I've tried some that slow a bow as much as 20 fps. Also, after market strings can change a bow speed dramatically.It's good to chrono your bow before and after before you make any change to your bowto make sure that what you're doing is not adverselyaffecting it.

Good additions that will quiet your bow withoutrobbing speed are. 1. Stabilizers. 2. Cable silencers 3. STS systemsand 4 limbs silencers. Another trick that will add speed (2fps or so in some cases)is to wrap your solid limbs in camo hunting fleece, it reduces vibration and adds a little speed.

And yes, I am a completenut when it comes to maximizingbow efficiency. It's an off season hobby of mine.