We did many significant improvements @ cuttingedge, so the large FPS gain is to be expected. Unfortunately NVidia optimus doesn't seem to like OpenGL to the extent, that fullscreen mode doesn't actually work when using the dedicated card. You are 100%ly correct with noticing that there is no difference between fullscreen and borderless using your discrete GPU.anember wrote:
I have a laptop with an i7-4700HQ plus GTX 850M combo, meaning Optimus with all its benefits and problems.
When I first installed osu, after a bit of fiddling with the settings I found that fullscreen mode running on the dedicated gpu results in what I perceived as no cursor latency. I'd love to use borderless like in virtually every other game I play but that causes a slight but noticeable delay.
Now when I tried out the cutting edge build (b20150825.10) I noticed that the familiar "slight but noticeable delay" is there in both fullscreen and borderless modes.
Long story short, I made a table showing perceived and reported latencies for every setting combination. When you look at the table you'll notice that I found the combination I'll be using when OpenGL hits stable but I thought you guys might use this to figure something out as I've already found a couple posts mentioning similar issues.
If nothing else, adding a note that integrated gpus have a potentially lower latency in such scenarios (as Tom94 seems to be aware) might be helpful.
The table
All tests are done on a clean install of Windows 10, default settings in both Intel and Nvidia graphics drivers, the laptop was plugged in, no fps limit in osu.
Perceived latency is a number on an arbitrary scale where 0 is the least latency I ever experienced in osu. A number larger than 2 would be what feels like more than 100ms latency like I was experiencing in CuttingEdge-Integrated-Borderless main menu. I wish there was a proper way to measure this.
FPS was measured on the offset wizard map because it's the only map where it was relatively stable.
What puzzles me is the large difference in performance in fullscreen and borderless modes as well as the better performance of the integrated gpu in the cutting edge build.
Luckily since the FPS is now so high with pretty much all integrated GPUs, there is no reason not to use it, save power, battery life and heat, and still enjoy osu! to its fullest.
We are still trying to get fullscreen to work via the compatibility mode option, but without it fullscreen will probably never happen.
PS: The delay you are noticing has nothing to do with optimus. It's good old windows itself. Fullscreen is the only way to get rid of it, unless you are using windows 7 or earlier.
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