[kronolith] Slow load caledars intems with dynamic mode

[Paul Ronald]

Hello,
The load of calendars items is very slow in dynamic mode, about 15 seconds.
The same calendars in basic mode take about 5 seconds.

Firefox show that services/ajax.php/kronolith/listCalendars take about 9
seconds.
I would to get a best performance into the load of calendars with dynamic
mode.

My installation of Horde has this versions:


   - Horde Groupware Webmail Editio Horde Groupware Webmail Edition 5.2.22
   - kronolith 4.2.23
   - gollem 3.0.12
   - turba 4.2.21
   - imp 6.2.21
   - ingo 3.2.16
   - horde 5.2.17
   - mnemo 4.2.14
   - nag 4.2.17


Best regards