Turbo Trainer Effort Problems

I have a Tacx Flow TT and when I use it I struggle to get any kind of speed dispite having the same cadence and effort as I do when out on the roads. Is this a set up problem? or is it just me. At the moment I can't do longer than 30 minutes because of the effort required however on the roads I can ride for as long as I want. Has anyone else experienced problems like this???
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Does anyone know how to the get the clock going faster on the turbo and slower on the road :?
A project for Prof Stephen Hawkings perhaps
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