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Sending attachments suddenly takes a long time

Hi experts!

We use exchange 2007 sp2 (installed on 2008 server x64) together with outlook 2003/2007 on vista/win7.
I hardly send large attachments so I am not able to tell for how long this problem exists. Problem is, that only very little bandwidth is used when sending attachments (in house). To send 10 MB took about two seconds, now it takes nearly 20 seconds - on each and any computer. There have been no changes at the mail server for a long time, only windows updates. The problem is reproducible even on clients that don't house any other software, only win7 and outlook. The server is definitely not low on resources (CPU/RAM/disk space).
Furthermore I tested accessing shares of that server and it is as fast as expected (nearly 100 MBit).

So my question is:
-has anyone of you seen a performance degrade similar to this?
-what could I do to get more info on what is going wrong?
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1 Solution
Leon FesterSenior Solutions ArchitectCommented:
Have you looked at any bandwidth throttling or QOS that is running on your routers?
Try running OWA session directly on the server if you can and see if that also takes long to send/deliver the message.

It should help you to discover if the Exchange Server itself is the problem, or if the problem is environment related.

Even if you were running RPC over HTTPS on your LAN you should still get better performance than that.
McKnifeAuthor Commented:
Good idea.
OWA opens very slow, takes about ten times longer to open than before. To upload attachments there is as slow as experienced with outlook. I noticed that the exchange certificate has just expired - I will renew it tomorrow and be back.
McKnifeAuthor Commented:
Ok, that was easier than I remembered... certificate renewed, no change (I did not expect it to change anything).

To adress your questions: No throttling, no QOS, no changes.
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McKnifeAuthor Commented:
To be more precise: opening OWA is fast again after I renewed the certificate, but uploading attachment isn't.
McKnifeAuthor Commented:
Now I finally found the time to analyse and find the culprit: LCR.
Local continuous replication - if suspended, performance returns to reasonable values. Since LCR is already on a different physical hard drive, I really don't know what to do about it (apart from turning it off)

I installed exchange 2007 sp3 - no change.

Anything else I could try?
McKnifeAuthor Commented:
I'd like to close this question as no relevant progress was made and I found the culprit myself. If anyone is interested, try this related question: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26504601.html
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