from preamble:

"Change Set:		spsBrowser
Date:			24 August 2001
Author:			Steven Swerling

The SPSBrowser is similar to the PackagePaneBrowser but enhances it in 2
ways. First, it adds a class hierarchy view using a widget based on the
SimpleHierarchicalListMorph, which you may be familiar with from the
object explorer. It sounds cramped, but it works out quite nicely.
Second, the performance is improved over the PackagePaneBrowser by
caching information about the SystemOrganization. This eliminates what
some may have noticed is a signifigant lag when selecting a method in
the PackagePaneBrowser (this is only noticable when one of the top level
packages is selected). It also reduces the toll that the
PackagePaneBrowser takes on the CPU (on my machine it was 1% of the
processor capacity for each open package browser).
 
"!
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