Daylight saving time makes hg slow until 'hg stat' is done (windows bug?)

[Andrei Vermel]

Just noticed something curious.
Right after the daylight saving time adjustment all hg operations became 
very noticably slower. On my repo of 30,000+ files say 'hg update' of 1 
changed file took over 10 min instead of usual 2 sec.

I believe this is because timestamps of checked out files somehow got out of 
sync with the ones recorded in .hg.
The speed only got back to norm after I did 'hg stat.
I wonder why other commands like 'hg update', which effectively do 'hg stat' 
inside do not update the recordered timestamps.

Andrei