We're on Creo 3.0, M070 and have noticed a performance issue when using the measure tool (summary). The assembly immediately bogs down and can't be rotated. Switching the selection filter from "smart" to anything else seems to make it behave better. I was wondering if there were other solutions that may address this, i.e. fixed in later build, config option setting, or something else we haven't thought of.
Do you have a lot of datum curves/sketches? Especially text. We were doing some proprietary and export control notes as sketches so they would export with STEP files and they absolutely brought the measure tool to it's knees on "Smart".