Sending email with 3mb attachment causes prolonged delays in Zimbra Web Calendar UI
I can reproduce this problem on two separate installations of Zimbra 3.2 running on Dell Xeon 3ghz/2gb RAM - 20 mailboxes and AMD64 3200/4gb RAM - 4 mailboxes. Both using CentOS Linux.
Here's the problem: when a user sends an email with 3mb attachment, it causes prolonged delays in Zimbra and most noticeably the Zimbra Web Calendar UI for ALL USERS. :(
This problem occurs both during high usage (all users sending/receiving) as well as low usage (when I was the only user sending email, other users still receiving).
Typical response times for changes to the Calendar goes from <2 seconds to >8 seconds up to 12 seconds. This is for such operations as simply moving Calendar entry date/times and saving new Calendar entries.
This delay will last for between 2 to 5 minutes after the email was sent. And after this time the usual responsiveness is restored (<2 seconds).
Has anyone seen this before? And any ideas on how this can be resolved?