I'm going to hazard a guess that the tyres are a bit draggy, or the sus fork needs servicing.
On @platypus 's?
He mentioned having Maxxis High Rollers, which are quite slow-rolling. Also, riding with a sus fork can feel weird after getting used to rigid, especially if it's been neglected, or set up badly.
Pure speculation, of course :-)
@spotter started
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I'm going to hazard a guess that the tyres are a bit draggy, or the sus fork needs servicing.