Preview unexpectedly slow

Hi,

I am a new user to Digikam, and I was looking to use it to select the 
best pictures I took on a holiday recently. I sorted the pictures (in 
JPEG format) into folders based on date (50-300 for every day), and then 
just wanted to scroll through them and put the best pictures into a 
different folder and tag them somehow.

However, I immediately noticed that the Preview window is very slow to 
scroll to new pictures. It often takes a second or more to go to the 
next picture. Once I've looked at the pictures it seems I can skim 
through them quickly, but at the start of a session the Preview window 
comes across as very sluggish and slow. I don't get this behavior when 
I'm just using Gwenview to view the photos, so I'm not sure what causes 
this.

I was wondering if this is expected behavior, a bug, or a 
misconfiguration on my part? In any case, it makes Digikam pretty 
unusable for me, so I'm hoping there's some kind of solution to this.

Sincerely,
Gilles