[CalendarServer-dev] Does timezones have to be so slow?

Cyrus Daboo cdaboo at apple.com
Wed Apr 21 05:02:35 PDT 2010

Hi Peter,

--On April 21, 2010 9:55:21 AM +0200 Peter Mogensen <apm at one.com> wrote:

> I'm experiencing slow REPORT/calendar-query responses on medium large
> calendars.
> calendarserver is spending a lot of time adding VTIMEZONE components to
> VEVENTS - and sadly it seems to be the same calculations done every time
> (all events are the same timezone).
> tzinfo is cached by vobject (helped by timezones.py), but the settzinfo
> method on TimezoneComponent is still doing the same job again and again.
> It would seem obvious to me to cache TimezoneComponent objects, maybe
> with a validity tag, which gives you the valid timerange for this
> VTIMEZONE component.
> This might also help get around the problem that vobject only expands
> timezone defs from 2000 to 2030
> Any gotcha, I've overlooked which explains why TimezoneComponents are not
> already cached?

Can you send the full request body for the calendar-query REPORTs that you 
are using so I can take a look at this?

Cyrus Daboo

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