After watching the FPS window more carefully it looks as if these spikes are being caused by the ‘Rdr Thread’ - unfortunately they disappear off the FPS display so quickly I cannot capture it but here is the windows task manager showing them. It is frustrating given my PC is hardly being stress to have to see spikes/stutters like this in even benign areas. Remember these are not random but are repeated at the same geographical location consistently. If it is the render thread I wonder if there is a problem with a model that is being loaded - not nothing obvious is appearing in the debug console window.
