There are a lot of variables in the actual performance of a bow. and there are different interpretations of what "High performance" means too....
You guys are right... The limb design itself is a very large portion of high performance.... and yes... once you start getting over the 190 fps mark, you are splitting hairs, using lighter weight materials, and doing some fine tuning to exactly where those limbs are bending to get to the 200 mark.... that's what i call "ringing the bell"
Building a high performance bow is not all about speed either...... You can build a hot rod bow that really smokes an arrow, but it's got a stiff feeling draw and is very "Twitchy". This makes it hard to shoot with good consistency...
but taking the time to balance a bow out for maximum stability, good core to glass ratio, and having a nice even load in the working portion of the limb, with a good string angle at full draw.... the speed of the bow is naturally i bit higher than average.... and it's a nice shooting bow ta boot....
To put it simply... the shape of the limb determines the potential for stored energy. a recurve design has the potential to be the fastest bow out there too.... but.... there is a huge difference between storing energy in a limb, and transferring that energy it to the arrow.
That's where mass weight of the limb itself and the ability to stop the forward motion dead comes into play...I've seen a lot of R/d long bows that rang the bell too. btw.... if you've got hand shock you are wasting energy that could go into the arrow....
good grief! Sorry i got so long winded here...
Kirk