RoundCube forces me to kill FireFox

David Abrahams dave at
Sat Jul 7 20:01:15 CEST 2007

on Sat Jul 07 2007, Jim Pingle <> wrote:

> David Abrahams wrote:
>>> I wonder if it's held up waiting on something, or if it is actually
>>> transferring data at that point. Either way you should be able to capture
>>> the last (few?) request(s) up to the point where it fails. That may go a
>>> long way toward figuring out where the problem lies...
>> There's hardly any traffic during that period.  Unfortunately it's a
>> bit hard to see what's going on over an https:// connection by looking
>> at tcpflow. :(
> I wonder if SSL might be part of the equation? Have you had a chance to try
> this on a plain http connection? I tried mine with SSL turned on and had no
> problems, but it's still something to try...
>>> I also wonder if this is related to the others who are seeing high CPU
>>> usage. You might check the recent thread about "100% CPU" to see if you
>>> might also have similar symptoms.
>> Their symptoms (100% cpu, browser lockup) look like mine, but their
>> circumstances seem to be mostly different.  It only happens to me
>> when viewing really large folders.  I'm using Cyrus and not Dovecot.
>> The IMAP server is on the same machine as the webserver.
> Ah, ok. How large? I tried with folders of between 1500 and 3000 messages,
> and the highest I could get apache to go with SSL was 72% for a second or
> two, and the folders still loaded, albeit a little slow.

Probably more than 10K messages.  If there's a big-O problem in one of
the JavaScript algorithms, a couple of seconds could turn into a
"hang" when you increase the dataset by an order of magnitude.

Dave Abrahams
Boost Consulting

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