In most cases, it is easier to reprocess the entire catalog rather than match up individual page changes. You, the client, determine your interface requirements for content. Because the client application can request various resolutions for display, the images will vary quite a bit. The amount of graphics also increases the size of the images. We have to put the normal caveat on response time issues.
Size does impact response time.
However, we are compared with all e-catalogers that provide parametric or Level 1 structured catalogs.