"Change Set:		FasterPrefs-nk
Date:			14 February 2001
Author:			Ned Konz

I noticed that Preferences higherPerformance
is being called from the main UI loop. Then I noticed
that this results in a lookup in a Dictionary, not an
IdentityDictionary, despite the fact that the keys are all
symbols.

This change set changes the Preferences FlagDictionary
into an IdentityDictionary.

It will report how much faster your Preferences flags
have become if you have a Transcript open (if you care).

On my system, a flag lookup went from 216usec to 28usec."!
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