Quality matters as well as speed though: reworking comes at a cost, so you really need to be tracking more than one metric. A lot of problems are caused by optimising for one metric above all else.

If it takes 1 quarter to develop a feature and a developer ships a feature in 1 quarter then that makes sense.

If it takes 2 weeks to ship a feature and a developer ships in 1 then yeah, I'm highly suspicious of that.