Hi,
for a friend of mine i made this Joomla website for a Historical Group.
I use the K2-tool for a big database.

The site is pretty slow and when trying to solve this, i saw that the database has been placed twice.
One time in Images
And one time (or actually two times) in Media > K2> items > cache
and in Media > K2 > items > src

I am pretty new to Joomla. Can i delete one set of images?
Or am i having a preference wrong?

Thanks for your time and effort.
Ton