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					Originally Posted by  Jo69
					 
				 
				They are 128 x 128 
 6.87 kb 
 
Changed it to 48 x 48 
3.46kb but still slow. 
 
I have saved them in my Documents Should I have saved them in calibre? 
			
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 You can download load them to wherever you want, but when you add the icon to 
Look and Feel->Column Icons->Add Rule, viz:
that will copy the selected file into the cc_icons subfolder in your calibre configuration folder, and I just noticed it seems to do some 'optimisation' as it does so, viz:
So re-sizing, and re-saving the original you put into your Documents folder will make no difference, because the file calibre will use is the one it copied into cc_icons.  
I normally download the png to my desktop, do any resizing and resizing there before adding the icon to calibre's column icons and then I throw the one on the desktop away.  
BR