Not really. I had a forest coaster w/ single faced trees in HR, and another forest coaster in NL with their trees. We all know HR runs alot slower that NL, right? Yet HR had the upper hand in the framerates. I had about 20 fps on my really old PC thats no longer useable, And the same 20 fps on my NEW, all powerfull PC. Having muilti-faced trees allows you to see the "edge" of the sides and just looks "papery". Not to mention the back of the tree, if you know what I mean.
Anyway, I hope they release 1.5 ASAP because it's taking kinda long.