I had the same problem for about a week. I tried recreating data, only 
saving 100 messages, compacting account, and nothing worked.
Until I turned off using names from Contacts in the display. Works fine now.
I have a very large and screwed up contacts list because Verizon backs them 
up and restores them, as does Google, but they end up creating duplicates.

My guess is a large contacts list now causes K9 mail to slow down to where 
it is unusable. Not using the list seems to be the workaround.

On Sunday, August 2, 2015 at 9:32:24 AM UTC-4, Germano Massullo wrote:
>
> Concerning the following message in 
> https://github.com/k9mail/k-9/wiki/ReleaseNotes
>  
>
>> Some longtime users of K-9 have reported incredibly slow message display 
>> times in 4.4. We haven't yet gotten our hands on a device that exhibits the 
>> problem, so we haven't been able to develop a proper fix. One thing that 
>> has worked for everyone who's tried it is to long-press on the account name 
>> in the account list and select "Recreate Data" -- This will COMPLETELY 
>> ERASE the local copy of your mail and redownload a brand new copy of 
>> everything from your server. Any mail that's on your device but not on your 
>> server will be DELETED.
>
> Often I am experiencing a really slow and laggish graphic user interface 
> on Android 5.1.1 and K-9 Mail 5.006
> I collected some debug infos in the way described in the webpage 
> https://github.com/k9mail/k-9/wiki/LoggingErrors
> The problem is that I have a 8000 lines log that I need to clean from 
> sensitive personal data. Do you know if there is a specific part that I can 
> extract and that would be useful for you to find out the problem (or the 
> bug)?
>

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