Since a few versions ago, Opera has started displaying unscaled thumbnails in speed dial, which I find invariably useless, most sites only showing a bit of logo and a header. I would like to return to the old style, where thumbnails were scaled (zoomed out, in most cases) to fit the full minimum width of the website inside the thumbnail. Some have suggested this trick, however it results in a thumbnail that does not get refreshed periodically.
The behavior seems to change arbitrarily between the old and the new way for some thumbnails every now and again. I would very much like to restore the old functionality without manually creating thumbnails for each and every site, since I use quite a few thumbnails that are reloaded every n minutes to get updates at a glance.
Desired behavior (left) and undesired behavior (right)