Would this be the right place to ask if the video compression has actually been optimised? I just upgraded a pair of DCS2132L's from their factory firmware v 1.01 to the latest v1.05.02, and at the same video setting the bandwidth (as reported by my DNR322) dropped from around 950kbps to around 250kbps. That's a 75% reduction in bandwidth with no changes in settings, so I assume it's simply down to optimisation. My DCS5222LB2, at firmware 2.03.01, at the same video settings as the 2132's (i.e. 1280x720, 15fps, fixed quality "good") are using 2500kbps. That's ten times the bandwidth and the same resolution.
Given the 75% drop I saw when upgrading the 2132's, I wonder if the 5222's also need a tweak?