Pictures on responsivegrid.items

Lets say, I want to show text and  pictures in a responsivegrid. It is easy to load pictures with url in the Items.html.

I want to minimize network traffic, so I thin about to load all pictures at start an then store them local, in a clientdataset or something else and show these pictures on the Items of the responsive grid.

Is this possible and how to do it?  

If you want to load all pictures once, you'd need to store the image as base64 enncoded data in the dataset and then assign it this way to the image URL 

Data URLs are explained here: