Originally Posted by
gregf83
Cant see how this is a problem in real life as the worst case shift times are under a second so you just have to pedal a little harder for a couple extra seconds to make up for any losses during a shift. For rear only shifts you can shift under load so there shouldn't normally be any power loss.
There is definitely a momentary power loss. there's a short interval when the chain is not exerting torque on either cog. As to whether it's a problem, that depends on values, I suppose. In a race or in an uphill competition, that "pedal a little harder" is already committed.
And no, it's not a big problem. I lose all the zwift races I enter anyway.