In 0.4 or in that private build? In all versions dude, all versions have lag, I don't care if you fix it or not, but just give me an explanation. I told you, to fix the lag I have to make the GPU gaming profile fixed, but who want 50+C GPU temp in idle/desktop mode... This tells me that your pretty app is hunger for GPU resources, I understand, debug version, alpha, etc. but I still want some answers. Thank you. Sounds more like your drivers aren't properly adjusting power states for the workload. Even if his implementation required 10x the resources and workload of MS's it should not produce a noticeable effect with a GTX 670 - it should be more than powerful enough to run dozens of fullscreen sheets of solid glass on top of each other without a hiccup. The problem is very likely on your end (drivers or profiles you made) since very few others seem to have the issue on what I would imagine to be less powerful hardware, unless everyone in this thread has a GTX680. I had no problem running his glass implementation from 0.3 on my 6950 and it showed almost no GPU utilization and near idle temperatures. And your GTX 670 should be faster than my 6950. I have the latest drivers, clean installation, no GPU custom profiles as I already said, the lag occur only with the low profiles, idle/dekstop... Forcing a higher profile will fix the problem but I don't like the idea of running a high profile in idle/desktop... I have no idea why I want so much the Aero but after a few weeks of using Win8 I couldn't find anything special so I'm thinking about going back to Win7, idk.