Spherical Panorama export framerate issue

Hey guys I am having difficulty with exporting some panoramics…I have followed the documentation regarding the -usefixedtimestep settings in the level play options, I’ve set my console commands in my level blueprint etc and the first half of my sequence renders fine. About halfway through my sequence it suddenly speeds up and seems to render what should be 2000 frames in a couple hundred. Nothing I’ve been tried seems to make a difference.