This would be the way I know best. A couple of time saving tips, when you come into Durrow, take the left that brings you into the car park infront of the hairdressers/chipper/hotel, jump out of the car and hit the pedestrian crossing button. This will force the traffic to stop giving you a quicker chance to take that right turn in Durrow. (Use only when your stuck!!Plain of the Herbs wrote:I came and went by Kilkenny and New Ross the last day. Now I'm not going to Wexford this time (one seventy minute spell of blunt force trauma is enough for one day), but Kilkenny is by-passed, and so is New Ross, leaving really only Portlaoise (which ye have to negotiate anyway) and the right turn onto the main road in Durrow, as the major stumbling blocks. Once ye pass the New Ross road rindybout, it's open country.

Then in Portlaoise take the left at the round-about at that round-about with the clock, follow the road up there and take the 2nd right (I think it's signposted) after the bridge, that'll bring you on a ring-road of sorts and avoid most of the hassle in Portlaoise.
Obviously I don't condone speeding but these might save you some time.