Extract from http://www.perforce.com/perforce/doc.061/user/relnotes.txt:

	#109240 **
	    The internal buffer on labels for 'p4 labels filespec' has
	    been raised from 10,000 to 1,000,000.  The command works
	    regardless of the number of labels being examined, but if
	    under the limit the command releases an important lock
	    (on db.domain) early, allowing other commands to run.
	    (Bug #22460).

	#109212 **
	    'p4 opened -a filename' has been sped up considerably for
	    sites with a large number of client workspaces.  Previously,
	    its performance was related to the total number of client
	    workspaces on the server, but now it is only affected by
	    the client workspaces that have the named file(s) opened.
	    (Bug #22288).

	#108308 **
	    Change 89167 introduced in r06.1 restricted the use of
	    '...' wildcards in client, branch and protections maps
	    in order to prevent excessive use of cpu and server crashes.
	    The limit imposed by that change was determined to be too
	    restrictive, so the limit was lifted. (Bug #21706)

	#108264 **
	    'p4 fstat -W <filepath>' performance could be very slow if
	    a large number of files are opened.  This has been fixed
	    (Bug #22306).

	#107809 **
	    'p4 integrate' would sometimes skip integrations when the
	    integration history involved a copy away from the target.
	    This has been corrected.  (Bug #22198).