Last time out they downed the previously unbeaten Scarlets and with 15 tries and 152 points from their first seven games, the signs are good.
But Dempsey sees room for improvement, especially with European Champions Cup games against Wasps and Bath on the horizon.
"I think if you look at the performance against Scarlets on Friday night, we created a lot but we didn't actually finish; we didn't capitalise on some of our plays," he told the Leinster website.
"That's an area that we've looked at and are going to highlight now this week heading into Wasps. We know we've got to be better than that in order to get the scores and capitalise on possession and territory in order to beat Wasps.
"I think you look at our performance against Treviso, we were a bit more pleased with some of our play. We had a number of entries into Scarlets' 22 but we didn't really come away with the scores we wanted.
"You can't go in at half-time 15-9 down against a team of the quality of Scarlets. We know if we do that next Sunday (against Wasps) we're going to be putting ourselves under a lot of pressure so we're going to have to be a lot better from the start, defensively and in attack."
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