Yes, it's possible that switching to single-sided might speed things up, assuming that double-sided are currently being used. I'll let JimO'Connor speak on that. From the brief time I was able to see the Mac version, it looked like CalcNormals might also be always-on. This can cause a real slowdown on Pentium-based machines, but I don't know about Macs.
Remember that this Mac version is an early Beta, and O'Connor's team has done an amazing job getting it as bug-free as it is. I'm sure that they will continue to find ways of increasing the frame-rate in the coming weeks.
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