Pardon the necromancer-like reply, but as this thread contains vital information, I saw no real reason to create a new one for the same topic.

I was looking through the alarm_queue.ini, initially afraid of removing all my calendar alarms.

The alarms listed in this file have an alarm_appid, which in my file is either worldclock_alarmd_id, Calendar or modest.

I began searching from the top of the file with "calendar" and "modest", and found that I have no such occurences within the first 3397 rows, so I deleted most of them, save for some of the highest up occurences. Some worldclock_alarm_id occurences were seemingly left at the end of the file as well, but I decided to let them live.
After that I performed these two commands gagravarr instructed:

• /etc/init.d/alarmd stop
• /etc/init.d/alarmd start

Now I have merely 6 alarms on the list, and the clock app starts in under 2 secs \o/

Would it be possible to create a script of some sort, that cleans this file of most (fixed number, all, dunno?) alarm occurences with alarm_appid: worldclock_alarmd_id?

EDIT:
It seems that the only consistent difference (excluding cookie and trigger as these are unique for each occurence) between listed active and inactive clock alarms are these flags:
Active alarms have flags: 136240
Inactive alarms have flags: 793648

Thus, as an occurence begins with [ and ends right before the next [, is it possible to code a thingy that goes through alarm_queue.ini and removes occurences which include alarm_appid: worldclock_alarmd_id and flags: 793648?
I don't have the knowledge to do so...