Apparently, list scrolling and messages selection seriously
lag only when "Show contact names" is set in Settings > Global
settings > Display.

HTH,
Mihai

On Fri, Aug 14, 2015 at 02:57:01PM +0200, Mihai T. Lazarescu wrote:

> I confirm the UI sluggishness on OnePlus One, 3 GB RAM,
> quad-core Snapdragon 801 @ 2.5 GHz, Android 5.0.2.
> 
> Selecting a message takes about 1 s and message list scrolling
> is far from fluid even with a handful of messages.  I have tried
> to both compact and rebuild the local data, but UI behavior
> did not change.
> 
> Mihai
> 
> On Thu, Aug 13, 2015 at 07:05:45PM -0700, Moop wrote:
> 
> > In this case it is a Snapdragon 410 (1,2 GHz quad core)
> > paired with 2 GB or RAM and Android 4.4.4 on a 720P screen.
> > However, just hardware performance can be pretty much excluded
> > as a cause.  Not only do smaller inboxes with an equal amount
> > of messages displayed (so the number of messages phone side
> > should be equal) have no issues, two other mail programs have
> > no trouble running the same large mail box without any lag.
> > If anything at all, there are some settings somewhere that
> > cause an insubordinate amount of processing to be done.
> > This phone can and should run this workload with absolute
> > ease and, in fact, it does run it with ease.  Just not in K-9.
> >
> > There is a rather high number of unread messages, I am not
> > sure that might make any difference.
> >
> > On Friday, 14 August 2015 02:18:33 UTC+2, Richard wrote:
> >
> >   I don't think I've ever encountered the slowness you are reporting.
> >
> >   As a test I just opened a mailbox that has ~5500 messages (~44mb in
> >   the message file on the server), pulled all ~5500 messages. I
> >   encountered no sluggishness issues going through the message list or
> >   opening any random message from anywhere in the list.
> >
> >   One note, this was the archive of a (mostly) text-only mailing list,
> >   so it's possible you are encountering html rendering issues, but I
> >   don't remember any issues on mailboxes that have a lot of
> >   html-encoded messages.
> >
> >   I did this on a:
> >      Samsung Note Edge (basically a Note-5, but with the edge screen)
> >      Android 5.0.1
> >      2.7 GHz Quad Core Processor
> >      3GB RAM
> >
> >   What is your device, and its specs?
> >
> >   > Date: Thursday, August 13, 2015 15:46:39 -0700
> >   > From: Moop <[email protected]>
> >   >
> >   > Thing is, the interface is even slow for me when I set this *Local
> >   > folder*  size to 25 or even 10 messages. The setting does not seem
> >   > to matter, as  long as K-9 tries to work with a large inbox (even
> >   > without loading the  messages), K-9 slows right down.
> >   >
> >   > On Thursday, 13 August 2015 16:39:23 UTC+2, Rodrigo Lopez wrote:
> >   >>
> >   >> As I am using POP3 accounts, there is a parameter in "Fetching
> >   >> mail" named  "Local folder size". The bigger that number, the
> >   >> slower the GUI gets for  me. Now it is set to 500, and the GUI is
> >   >> laggy.
> >   >>
> >   >> So, probably your assumption is right, K-9 has problems dealing
> >   >> with big  mailboxes. I wonder why there is an option for 10.000
> >   >> local folder size...
> >   >>
> >   >> On Thursday, August 13, 2015 at 3:00:02 AM UTC+2, Moop wrote:
> >   >>>
> >   >>> On Wednesday, 12 August 2015 16:04:48 UTC+2, Rodrigo Lopez wrote:
> >   >>>>
> >   >>>> Exactly same issue here, which is your local folder size?
> >   >>>>
> >   >>>
> >   >>> I am not sure what you mean exactly, but your comment has given
> >   >>> me an  idea. When I load my main account with many thousands of
> >   >>> e-mails and also  lots of unread mails, I get slow performance.
> >   >>> When I load an account with  few e-mails and not so many unread
> >   >>> mails I get good performance. This even  happens when I limit
> >   >>> the fetching to the past two weeks, or to 25 mails.  This is all
> >   >>> using IMAP.
> >   >>>
> >   >>> It seems K-9 has trouble with dealing with a mailbox with a
> >   >>> large volume  of mail, even if only a small portion of this mail
> >   >>> is loaded.

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