Please note there was also an issue with the default texture cache size being too small for most startup projects, causing cpu spikes at launch to rebuild the cache.  You may want to check your windows poser.ini/poser prefs on mac. From release notes:

- Improved texture cache performance by increasing the default max size for Poser temp texture cache from 500MB to 1GB. Reduces CPU usage on launch. #1086
NOTE: Users with an existing poser.ini setting will still the use the default max size of 500M or the value they set.