I was experiencing poor performance on my new MacBook Pro when running Logos 4 for Mac. Frustrated by this for a few months now I write about it on my blog and complained here. I then did an upgrade, installing a new hard drive that is much faster. Immediately after the upgrade Logos was still very sluggish. My conclusion was that Logos was not coded well and I must admit I sort of went overboard, even to the point of planning to do a full comparison video between Logos in OS X and running on the same machine in Parallels/Windows 7. The problem was that my hybrid hard drive started learning that I use Logos a lot and began organizing the files on the SSD portion of the drive. During my test i did the Parallels demo first. It took a minute to load but was fast otherwise. Then I loaded the Mac version and it didn't load the same desktop (Logos for win and Logos for Mac seldom sync properly). So to make it fair I set up up my desktop the same way and restarted. Guess what? it loaded quickly, much more quickly this second time. 17 seconds quick. And it responded very quickly. So my test showed that my complaints were no longer valid.
So here I am offering my mea culpa. Get a very high powered MacBook Pro and an expensive hard drive upgrade and Logos 4 for Mac will run well.