All, if you check the memory utilisation via CLI you'll likely see the same high memory utilisation. The ASR hardware plaftorm is a indeed a weird and wonderful beast with a number of different memory areas. Some of these are allocated on initialization and, irrespective of load, will remain at a constant 60-70% util.
I would suggest this is a more a question for Cisco than Solarwinds. I'll see if I can dig out some TAC notes on the subject.
HTH
Tim