365 Exchange online very slow to download old email ?

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1101

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#277020 22-Sep-2020 09:05

I know 365 Exchange throttles speed on dumps to PST
But does 365 Exch also throttle speeds when downloading old email ? are they essentially the same thing ?

Even setting the cached email to ONLY cache 1 month's , took an eternity to download/sync.
Tried 2 PC's , via Fibre connection, ADSL Speed test showed reasonable internet speed (approx 50Mbs)
The speed was so slow I could see the old email populating slowly one by one , with an occasional burst of 5 or so

Does MS 365 Exch also now throttling downloading old emails ?
Has anyone else recently noticed rediculously slow downloading of old emails . Ive never seen this slowness with 365 Exch before (Or maybee I just never noticed it ? )
Cheers

freitasm

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#2571832 22-Sep-2020 10:23

Which region is the mailbox hosted? What ISP? Old mailboxes were hosted in Singapore... New ones seemed to be Sydney - or you can move it. There are some ISPs that will transit directly to Azure making things faster.

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1101

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#2571912 22-Sep-2020 11:58

freitasm:

Which region is the mailbox hosted? What ISP? Old mailboxes were hosted in Singapore... New ones seemed to be Sydney - or you can move it. There are some ISPs that will transit directly to Azure making things faster.

Im not what region they are hosted, I'll see if I can find out
The 365 a/c's where only created this year , so Sydney perhaps ?

Their ACTUAL ISP is perhaps callplus. Im not 100% sure as its via a IP phone company who are reselling another ISP's product/internet .

Im trying again in our workshop (ISP Orcon) , seems just as slow .
on a new outlook profile : 15minutes to download 1 months inbox only (1.2Gb OST size ) , now downloading the other folders
Its so slow that I can see each old email coming in one by one (and a bunch of 5 or so every now & then )

Its slow enough that uncached mode in Outlook was causing noticeable lag .

1101

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#2572016 22-Sep-2020 13:51

The 365 datacentre is Aus (I just checked).

SATTV

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#2572172 22-Sep-2020 15:08

Yes Microsoft deliberately slow their exchange server access as there are possibly several thousand mail connections going at the same server at the same time, while they have good internet connections in the DC there are also thousands of other servers doing exchange / onedrive / sharepoint / Azure etc etc etc. so there is a possibility that there can be satuated connections if a bunch of people try to create new profiles at the same time.

The joys of a shared resource.

John

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#2572189 22-Sep-2020 15:33

I've just installed MAPI support on our Smartermail server. Syncing Windows Outlook (2019) is not fast. For 6 months email (about 7GB) took about 1-2 hours on a 500mbps connection with 1-2ms latency.

So perhaps its just protocol limitations?

Speedtest 2019-10-14

wratterus

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#2572206 22-Sep-2020 16:24

I think Hosted Exchange has been slower than normal recently. It's never been lightning fast, but I've even seen Outlook itself hanging/not responding from time to time where that never used to happen. Hard to pin down what is causing that though.