[mythtv-users] Sluggish watch recordings list after 0.27 upgrade.

[Bryan Bennetts]

On Dec 3, 2013 6:35 PM, "Stuart Morgan" <stuart at tase.co.uk> wrote:
>
> On Tuesday 03 Dec 2013 10:06:04 Jim Stichnoth wrote:
> > On Tue, Dec 3, 2013 at 7:13 AM, Bryan Bennetts
> <bryan.bennetts at gmail.com>wrote:
> > > Hi all,
> > >
> > > I've upgraded to mythbuntu 13.10/mythtv 0.27 and am now finding that
one
> > > of my frontend's Watch Recordings view is somewhat sluggish.
> > >
> > > That machine is a Acer Revo 3700 (with 4G of ram IIRC) so not hugely
> > > over-powered but on 0.26 there was no perceivable issue.  I have tried
> > > creating my own MythBuntu theme with the fanart turned off, but that
has
> > > not improved performance.
> > >
> > > It *seems* to be related to the length of the episodes list as when
> > > scrolling down the left hand panel it is noticably faster for, say,
films
> > > (split second scrolling) than children's programs (of which we have
> > > plenty,
> > > can take a good 3-4 seconds to populate the right hand panel).  This
> > > implies that the menu *may* be doing an operation per episode.
> > >
> > > Anyone have any thoughts on how to diagnose/resolve this?
> >
> > I have this same issue on my ION frontends.  I believe it has to do
with a
> > 0.27 change where the frontend now asks the backend to generate preview
> > images at full resolution before scaling locally to the theme-specified
> > resolution, instead of generating smaller preview images on the backend
> > which are rescaled again on the frontend.
>
> The scaling is done in a background thread, therefore wouldn't affect
> responsiveness unless threading wasn't enabled. Moreover, since the
preview
> image is cached locally after scaling, it wouldn't affect scrolling
through the
> list unless there were always new recordings which required new preview
> images. Which isn't to say that the issue isn't preview related somehow,
just
> that it's not related to the scaling.
>
> --
> Stuart Morgan
> MythTV
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> mythtv-users at mythtv.org
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Hmm, well I'll try paring down the theme more to see if affects the
behaviour.  I would hope that the code isn't generating a preview for each
episode just as the  main tile is selected in the left hand list.

Cheers, Bryan.
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