It looks like this seriously affects the user experience too.

Take about 40-50 photos. Run gallery-app. Go to the photo roll.

Scroll up and down until all the thumbnails have been generated. (This
loads up the cache.)

Run tail -f ~/.cache/upstart/dbus.log on the phone.

Now scroll up and down in the photo roll.

The trace shows that all the thumbnail requests are made with
QSize(-1,-1). The thumbnailer delivers each thumbnail in around 1.5
msec. But the screen shows lots of spinners for quite some time.
Presumably, that's happening because all the thumbnails are 1920 in
size, but need to be scaled down to the size required on-screen. Asking
for the thumbnails in the correct size would make things go considerably
faster, I suspect.

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https://bugs.launchpad.net/bugs/1467743

Title:
  Lots of thumbnail requests with invalid size

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