I’m running 2.2.453 on a MacBook Pro 2010 with 4 GB RAM and a 500 GB Samsung SSD; in discover mode the application seems really laggy; it’s slow to let me click on interface elements and networks, and slow to do things like resize the window. This has been true in both Mac OS X 10.8 and 10.9.
The new build fixes a number of issues in the previous build related to this post. So getting the update is highly recommended: /help/netspot-2-2/#ns-2-2-460