I waited for the demo, as I read that many people find Dorico slow.
I’m running it on a 2013 Samsung laptop with an i5m processor (two cores) and find the performance perfectly fine. On big files I can get a little delay when changing screen mode (or big delay if using galley view), but things like scrolling are faultless so far. I have 6 gigs of ram and 1920x1080 resolution with discrete graphics. I have tried both Halion SO and VE Pro hosting various VSL instruments in MIR Pro. The interface is no slower than Finale 2012, and playback is way more efficient.
I thought it was worth mentioning, as it might be helpful for someone with a less high-spec computer.
One more thing, the generic ASIO driver gives me a blue screen, but this also happens if I use it for Cubase (since version 7). Other ASIO drivers work just as well as with Cubase.