Raster images load very slowly


I am trying to attach multiple raster images totaling around 1 GB of data. The rasters are aerial images that were taken from NearMaps. I am having trouble with how slowly the rasters are loading. It can take up to 15 minutes for a few rasters to load, and I have never gotten all of the rasters to load (50 images) at the same time.

Does anyone have any suggestions on how I can get these aerials to load faster?

Thanks in advance.