Probably not new info for the pros here, but:
My son bought a new SawStop. After setting it up he was doing some test cuts, and said he was seeing about 0.003" difference at the ends of a 24" long ripped piece (narrower at the leading edge). Normally, 0.003" would not be a problem, but we did some sleuthing to find the source. This is what was happening.
He was not using a featherboard, which was a clue. With the saw off, and the blade clamped onto the riving knife, we found that the blade will deflect to the left when a test piece was pushed against the blade, and the piece would lift away from the fence at the leading edge. The greater the offset between push point and blade line the greater the deflection, which makes sense.
Adding a featherboard eliminated almost all deflection, though some could still be seen if pushing harder than normal (or advised) adjacent to the fence.
Test cuts using feather board and pushing closer to the blade line resulted in 0.0005" differences. The miter slot location limits the use of a featherboard to narrower pieces, so wider pieces would benefit from pushing nearer the blade line rather than at the fence.
All this is probably somewhere in table saw operating guides, but we thought we would share.
Kevin