Tickets :: Comment on [#8196] Dimp folder list never shows up when there is many (>1000) folders

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Comment	>> In Dimp, there is no way to work with only some folders (say, > >> personal folder and no shared / other user namespace) and access the > >> other folders in a more static way like in Imp. > > > > Correct - this is by design. > > > >> In this case, there are shared folders with customer informations (a > >> customer = a folder). They are nested (no more than 100 at a given > >> level, so if it where possible to request and display only the top > >> folders it would be ok. > >> > >> I'm not that experienced in web programming (especially json, ajax > >> etc), but isn't there a way to ask IMP the top folders list only, and > >> to refresh the list only when a subfolder is requested ? > > > > Technically this is possible, but it adds a bunch of complexity, > provides for a much slower UI (certain IMAP servers are notoriously > slow at returning mailbox lists), and for the 99.9% of people without > 1000's of folders, it is not needed. > > > > I optimized a few things in IMP 5 in the last few days to cut down on > the JSON data size. JSON data size is one of the areas that might > cause a slowdown - older browsers can take a long time to parse a > long JSON string. But even with 1000's of folders the JSON data size > is only 70-100KB. And upcoming browsers will have json parsing > support built-in so this will become less of an issue going forward. > > > > The more important issue has to do with javascript event handling. > In DIMP 1.x, each folder inserted into the DOM required at least 1 > event handler to be attached (others were attached on the first > mouseover). Thus, inserting 1500 folders into the DOM required 2000+ > event handlers. This is not a great thing and I guarantee older > browsers would probably be sluggish simply because of this issue. > The dimp interface in IMP 5 has already had its event model > rewritten. Now, even after inserting 1500 folders, the dimp screen > only has 7 total event handlers registered. This alone should fix > any problems with display. > > > > FWIW, I can display 1500 folders just fine on DIMP 1.x, albeit with a > bit of a lag during loading (I am using a reasonably fast Dual Core > machine running FF 3). With the improvements mentioned above that > have already been implemented in IMP 5, I don't think there is much > more we need to do going forward - squeezing out even more > performance for those .1% of people who have thousands of mailboxes > simply isn't worth it. > > > >> I know there is a hook to hide shared folders, but when using it, is > >> there a way to access hidden folders (other than going to imp) ? > >> Also, would this be a setting that could be changed for some users > >> only ? > > > > I assume you are talking about IMAP subscriptions and, at the moment, > there is no support for this in dimp (although it is on the TODO > list).
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