For grins after Christmas 2011 purchases, issued "rebuild index" command in Logos 4.5 Beta 12 on Mac and PC.
PC quad core i7-2630QM 2.0 GHz with 8 GB RAM indexed 6,011 resources in 1 hour, 7 minutes, 53 seconds.
In contrast. library indexing on Mac using quad core i7 running at 2.93 GHz had completed 632 out of 6,006 resources during the same time.
Forum thread => What's your benchmark? includes
Mac => http://community.logos.com/forums/p/24555/255412.aspx#255412
PC => http://community.logos.com/forums/p/24555/254929.aspx#254929
Comparing NovaBench scores, noticed Mac i7 is 40 % faster than PC i7 for floating point, however PC i7 is 14 % faster for integer calculations. The hard drives are 7200 RPM. Hence would anticipate library indexing time to be similar on Mac and PC instead of Logos 4.5 Beta 12 on Mac being significantly slower.
Looking at Apple's Activity Monitor, noticed indexer ranging from 5.3 % to 168 %, which is much less than nearly 400 % usage in older Logos 4 Mac releases (used to rebuild indexes more often with Alpha pre-releases).
Appears advice for indexing Logos 4 Mac overnight is practical since I'm currently estimating ~10 hours for library index on Mac vis 3.25 hours on PC (to index and merge postings)
Keep Smiling [:)]