Process load much higher under 2007e vs 2006c

I installed uw-imap 2007e over the weekend, replacing 2006c.   Things 
seemed to be mostly working.   Our server is Solaris 10.  Users mostly 
use Thunderbird (Mac & Windows) imap.  A fair number of Apple Mail 
users.  A smattering of other clients.

BUT....  Today when the system got under load, our load average shot up 
to about 100.   All the processes at the top of top were imapd.   We 
couldn't tell what changed about imapd that was specifically the cause.

We had some reports of problems being worse on Windows TB than Mac TB 
for at least one user that tried both.  In general most of the users 
seeing the worst of it were Windows users, but that may be just an 
effect of the time of day (more Windows users in the morning).

We dropped back to 2006c and things seem better.   The load is somewhat 
high currently, but that's probably because of 4 hours of impaired mail 
reading and users are catching up.

I just looked through the release notes
   http://www.washington.edu/imap/documentation/RELNOTES.html
Not suprisingly, the notes don't mention (directly) that anything was 
done that would impair performance.  The only significant changes 
mentioned are
   2006i (COPYUID/APPENDUID)
   2006k (mbx lock issue)

Is this performance hit a known issue?  If so, any guidance on what we 
might have seen?   (I'm trying to move to MIX format, but the advice on 
this list was to upgrade to the latest uw-imap version before seriously 
using it.)

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