Turf is not harder to run on than dirt, if both are dry, it's easier. As has been mentioned, kickback is not as bad on turf as dirt so jockeys don't have to worry so much about laying off the lead a bit, and then maybe the horse not wanting to close into kickback as on the dirt.
There is also the factor of turn radius being generally tighter on the turf courses, in the US, because they are inside the dirt course. It's harder to carry speed into and around tighter turns.
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