Can lower quality (LQ) images be used while editing but high quality (HQ) images leveraged when printing or exporting?

Yes, you can provide LQ images while editing and replace all images with their HQ counterpart during export by leveraging our CE.SDK Scene & Block API or by changing asset base paths via our Variable API. Note that CE.SDK will use the best image quality possible during editing automatically. Though, asset download size can be reduced via the aforementioned approach.