With the "new" field turf surfaces used now across the league the impact is negligible. These aren't the "Astro Turf" fields of the olden days where it was like playing on a carpet.
These newer artificial surfaces are more "grasslike" than anything. The blades of turf are as long as most grass fields. And with all the rubber pellets used it actually plays slower in most cases. If you've ever been on one you'd understand. In fact, many of the natural grass fields May in fact play "faster" than the Field Turf surfaces.