Yeah my performance is even worse on this patch. Gone from max 650 radius planets down to 500 just to keep the game vaguely playable for me.
I remember someone somewhere mentioned making extra sure your drivers were updated, and specifically asking not to rely on Windows Update. Could that be it?
Yeah I'm going to update my drivers and perhaps try out the beta drivers. However I'm fairly convinced it's the sim slowing down that is lagging me out.
Always worth a try. Sometimes the solution that's so simple and obvious that it could never possibly work actually works. If it's a CPU thing you could also try to give it higher priority in task manager.
I always update my graphics drivers (beta/whql) as soon as they are available. It's nothing to do with drivers. I never checked my CPU/GPU usage before the latest patch so I don't know if it's worse or always been this way.
Latest patch (61450) is awesome... went from less than 50% GPU/CPU usage to 100% GPU and average 80% CPU.