[horde] Improving ActiveSync speed on large mailboxes

[Sebastian Arcus]

Of course - whenever you are ready and have time. Sorry to swamp you 
with all sorts of requests. The issue with Gmail getting stuck during 
sync already looks a lot better - thank you very much for the changes



On 14/07/2026 10:31, Torben Dannhauer wrote:
> There are some ideas, let me finish first the streaming topic and get 
> things stable for all different scenarios you guys are fighting with, 
> then let’s work on speed improvement
> 
> 
> Von unterwegs gesendet
> Sent from mobile
> 
> 
>> Am 13.07.2026 um 17:42 schrieb Sebastian Arcus <s.arcus at open-t.co.uk>:
>>
>> If you could bear with me a little as this is a subject I know very 
>> little about. On IMAP, one feature which really helps with very large 
>> mailboxes, specially on mobile clients, is the ability to download 
>> only the headers and only request the email body when the actual email 
>> is opened on the devices.
>>
>> I gather (if my research is correct) that EAS doesn't have a direct 
>> equivalent. Instead it relies on the client requesting how much of the 
>> email body it wants to receive via the TruncationSize parameter.
>>
>> I also gather (if this is correct), that there is no way to configure 
>> this parameter in the Gmail app on Android. Looking at the ActiveSync 
>> logs, it seems Gmail requests by default 200000 (byes, I assume?). I 
>> wonder if it would be feasible at all to have a configurable override 
>> in Horde, in the ActiveSync section - something like 
>> "override_truncationsize" - to be able to set this to zero - and thus 
>> force the client to only download the headers. I think this might 
>> speed up considerably loading of large mail folders - and save quite a 
>> bit of storage space on client devices as well.
>>
>> As it stands at the moment, I find downloading of large Inboxes over 
>> EAS very slow compared to IMAP.
>>
>> However, I have no idea if the above is at all feasible and workable 
>> within the limits of the EAS protocol?
>> -- 
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