Bug#614783: merkaartor: Merkaartor becoming sluggish after zoom operations

[Steffen Grunewald]

On Thu, Sep 24, 2015 at 10:42:45AM +0200, Bas Couwenberg wrote:
> On 2015-09-24 10:19, Steffen Grunewald wrote:
> >On Sun, Sep 20, 2015 at 09:47:06PM +0200, Sebastiaan Couwenberg wrote:
> >>> You just might want to stick with a stable release and install the
> >>> backport I'll provide in a few days.
> >>
> >>It looks like the backport never happened, but merkaartor
> >>(0.18.1-3) has
> >>been in Debian since wheezy.
> >>
> >>Is this issue still relevant?
> >
> >Apparently yes, at least in Jessie (and Wheezy, of course).
> >Zooming in through the "100 m" scale makes the machine extremely slow,
> >although there are close to no objects to be handled (and
> >background images
> >are turned off).
> >With Bing imagery on, this zooming tends to kill Merkaartor.
> 
> What are the specs of the machine in question?

Netbook, 4 years old, 2GB RAM, Intel dual-core Atom N450 @ 1.66GHz,
but also seen on a "Intel(R) Core(TM)2 Quad CPU    Q9550  @ 2.83GHz" with 4GB

> It may just be that my machine is powerful enough to handle the
> amount of data and rendering thereof.

The problem is that there is almost no data to be rendered (Ethiopian
desert)

> Or it may be specific to the area your working in. How can I
> reproduce your issue?

This is my bookmark. There are two power lines "ending" in the area,
try to find the next towers by guessing their locations and zooming
around.
With 200m or even coarser all ist fine and fast. Try to go down to
50m and feel the sluggishness:

<Bookmark name="x">
 <Coordinates>
  <topright lon="40.1708760" lat="9.0160898">
  <bottomleft lon="40.1175564" lat="8.9737065">
 </Coordinates>
</Bookmark>

> >>Since I cannot reproduce this issue with the current merkaartor
> >>version
> >>in unstable (0.18.1-3+b7), I'm tempted to close this issue as fixed.
> >
> >Is there a backport I can try with Jessie? I don't like bugs being
> >closed when there's no solution for stable...
> 
> There is nothing to backport yet, merkaartor 0.18.1 is in wheezy,
> jessie & stretch.

But apparently the behaviour has changed between wheezy and jessie
(no more dirty opbjects after upload), so they aren't identical?

- S