I make it a priority to stay up-to-date with all of the latest NPM, SAM, UDT and IPAM versions. After the last major update of NPM, I found myself lamenting the fact that the "new graphs" which are much more slick and interactive and I like very much, were causing Orion to be very sluggish when loading many of my views. I have put up with the slow performance for the last several months until earlier this week when I decided to upgrade to IE 10 (I use Windows 7 as my primary OS). After the upgrade to IE 10, Orion performance has been BETTER THAN IT EVER HAS BEEN!!! I am very impressed with the improvements, so much so, that I felt compelled to share in case someone else is suffering along with slow loading Orion views.
Also Firefox and Google Chrome works great.