Dynamic down-ressing is a feature of FCP's RT engine. There are certain features that aren't available in the RT engine, and if your plugin uses one of those features, we'll run it in another, "non-RT" codepath that doesn't do dynamic quality adjustment. If you use the FxTemporalAPI (and set the mayRemapTime flag in your poperties dict), you'll find yourself in this state. You'll also find yourself here if you have any non-empty image well parameters.