Kevlar tyres

I've had quite a few punctures recently and received a nice cut in my rear tyre this week that finally put paid to things, so I invested in a new tyre and plumped for a kevlar one.
Had my first long ride today and things felt a little sluggish. Could this be the tyre or is a bad workman blaming his tools?
Had my first long ride today and things felt a little sluggish. Could this be the tyre or is a bad workman blaming his tools?

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