The Documentation in the wiki mentions much improved load times:
Loading time of a project has been significantly reduced: Projects saved from v2.1 and higher load fast whereas releases prior to 2.1 load slowly. The cache feature of Panotour v2.1 significantly increases productivity and reduces drastically the loading time of large Panotour project containing HD panoramas or Gigapixels. ..... For example: Just a quick bench done on the project of the "Lac du Bourget" tour : http://www.kolor.com/virtual-tours/2013 ... rget-lake/
This tour contains 23 panoramas including 3 gigapixels.
Loading this project took 22 minutes with the 2.0 version.
Once saved with the 2.1 version, the load takes 12 seconds!. In this case the opening is 100x faster!!
This feature increases comfort and smoothness in the Hotspot Editor, learn more in Hotspot Editor Low and High Resolution
I am not finding it that fast and the Exit time is very long, for a project of 50 panos, 7 plans, with 21 Notification plugins, 30 gallery plugins and 13 general plugins it take 50 seconds to load the project and around 7 minutes to exit even when I have previously exit the project, reloaded and then made no changes and exit again. This is on a Windows 7 64bit PC with 32Gb RAM 240 SSD and Sandy Bridge iCore 7 2600K CPU (4 core HT = 8 virtual cores). This project on another PC with 8Gb RAM Q6700 Quad core CPU and 2TB HDD took forever to even load!!