These Titans?
Anyway, would it be possible for you to test something for me? There is a setting in AppConfig.xml in the main game directory called "PreferNativeDoubles". Evidently it has to do with the default precision of terrain generation and is set to "false" by default. With the GPUs that I have with significantly lower FP64 than FP32 performance changing this setting to true seems to produce a moderate frame rate hit with little benefit. Could you change the value to true and see what sort of performance you get on planetary surfaces, and if there are any loading/LOD improvements?
Titan Black cards, EVGA "Superclocked" version – I like to think it has a slightly higher parts binning, but not sure.
I rolled back my Nvidia drivers to a slightly earlier version since the previous screenshot I posted, because the newer drivers weren't working well with some double precision OpenCL tasks, causing them to error out. The slightly older drivers may be why there seems to be a slight performance hit in the game in the following screenshots, or it may just be because I'm on a different world, etc.
I couldn't really tell much of a difference with PreferNativeDoubles="true" saved and reloading. If anything it was maybe just a bit lower FPS.
I restarted the game before each test screenshot to try and minimize any GPU temperature differences, etc.
Before...
After...
And here's with double precision optimization disabled and the "false" setting saved...
So, too close to call, I'd say, though not much if any significant difference for game performance.
One thing to note though with double precision optimization enabled on these cards, they don't tend to run single double precision tasks much if at all faster, they can just be loaded with more tasks running in parallel without loading up the GPUs as much.
That doesn't seem to be the case with some AMD cards that have higher double precision performance. They will actually tend to run single double precision tasks much faster than Nvidia cards. So there may be more of a performance boost with this setting changed on some AMD cards.
...
Edit: Also note that the "glow" reflection in the shadows is just due to the normal slow breathing type lighting effect I get on the dark side of worlds and isn't because of any setting changes. It didn't affect the FPS.