In addition to the considerations that apply to all controls, you should note the following:

In a WAN environment, you must be particularly careful with pictures that you load using SAPR3 URLs and the Data Provider. These URLs are generated by the programmer using the function module DP_CREATE_URL. In this case, you should ensure that the total size of all pictures that you intend to display simultaneously does not exceed 30 KB. For this reason, you should always use GIF or JPG format instead of BMP. (GIF and JPG are compressed, and therefore occupy less memory.)

The same applies if you load pictures from a web server that you address over a WAN.