[horde] Improving ActiveSync speed on large mailboxes

[Nels Lindquist]

On 2026-07-14 9:32 AM, Sebastian Arcus wrote:
> On 14/07/2026 15:40, Nels Lindquist wrote:
>> Hi, Sebastian.
>>
>> On 2026-07-13 9:41 AM, Sebastian Arcus wrote:

<SNIP>

>> Do you have imap caching enabled in imp? If so, what cache driver are 
>> you using?
>>
>> Is there a reason you need to have entire mailboxes with all 
>> historical mail loaded on mobile devices? It's pretty typical for the 
>> client to only download the last 30 days worth of messages, with 
>> remote search available to access older messages on demand.
> 
> I configure mobile clients to only download 1 month worth of emails. 
> These are very busy mailboxes, and although it works, it is very slow to 
> load the initial list in Gmail and generally to configure and use. A 
> significant reason behind this is that Gmail requests a lot of data. 
> Looking at the logs, iOS Mail app seems to request 500 byes per message, 
> while Gmail requests 200 000. That is 40 times more data. The iOS Mail 
> app is far faster to load the list and generally to work with email 
> using ActiveSync. Even searches use the same truncation parameter, so 
> returning search results is much slower in Gmail (aside from the fact 
> that Gmail insists on searching all folders - but that's an issue to be 
> tackled separately). If Horde would have something like ['activesync'] 
> ['force_truncation_size'] to override the client and return 500 byes (or 
> some other size configurable by the admin) per message when talking to 
> the Gmail app, like in the case of iOS Mail, Gmail should be 
> significantly more responsive and efficient.

How about the imap caching?

-- 
Nels Lindquist
nlindq at maei.ca