“1. How do you pump trails on a fixie (being as you can’t pedal and pump simultaneously)?
2. When your wheels are off the ground, I assume you’ll have to keep pedaling in the air to avoid landing effectively on the brakes?
3. …and surely you’ll be unable to weight the pedals properly in fast corners?
4. How do you manual through compressions?”
Well, the facetious answer is “same as normal, but just keep pedalling!”.
Except for 2 (where the answer is, it’s complex, stopping pedalling in the air is a useful technique, look up ‘fixie skid’), I guess the answer is it’s not about being quickest.
Admittedly I probably have a twisted point of view here, having learnt to unicycle before riding fixed – so a fixed bike to me is a unicycle with an extra wheel hanging out the front.