Done, here is mine :

NOTE: When LFS is minimised, I have 25% GPU usage while it's at 0% when LFS is in fullscreen.

This is with Windows 10 Pro Insider Preview (build 10074).

My GPU and CPU usage stays the same now when minimized.

Here is mine.

Thanks for that. You all get the same delay as I do with WM_WINDOWPOSCHANGED. It only gets to LFS when you restore the Window, after that time gap. So that message is no help at all.

The problem, I believe, is that in Windows 10 the WM_ACTIVATE message does not have the "minimised" value set.
WM_ACTIVATE - WA_INACTIVE / minimised = 0

Maybe I can just get around this by taking the other part of the WM_ACTIVATE message - WA_INACTIVE. Because if the window is full screen then it should be 'active' which means it receives keyboard input. Maybe it is enough to assume that if LFS is in full screen mode, but gets a WA_INACTIVE in a WM_ACTIVATE message, then it can assume it is minimised.

By the way, RC-Maus - I think you posted my log by mistake.

Haha sorry my mistake

deb.txt attached, GPU usage 93% when I alt tab.

edit: I see I'm late.

here the log.

Wow there are a lot of Windows 10 users! Thanks again for your help.

Here is an exe that I think will fix the problem, and uses the same method regardless of which version of Windows is being used.

http://www.lfs.net/file_lfs.php?name=LFS_6H9_EXE.zip

Yes, now it uses no GPU/CPU when minimised.

Problem seems solved GPU goes 0% and CPU goes 1% when minimized alt tab.

Here too, thanks for the fix.

Relief!

Is it also OK when minimised by the minimise button in windowed mode?

Quote from Scawen :

Relief!

Is it also OK when minimised by the minimise button in windowed mode?

Yes it's okay

Just tested it on both my Win10 laptop and Win7 desktop and it seems to be working correctly on both systems and in both cases of full-screen alt-tab and windowed minimized.

Thanks for the quick fix, no cpu usage when minimised - also ok when minimised by the minimise button.

another log with the lastest exe.

Quote from askoff :

Have any of you tried what hapens if you switch the virtual desktop in Windows 10? That might be something to take account as well.

Anyone tried this? I've been wondering the same thing.

Quote from Victor :

Quote from askoff :

Have any of you tried what hapens if you switch the virtual desktop in Windows 10? That might be something to take account as well.

Anyone tried this? I've been wondering the same thing.

Works fine, 0% GPU usage when switching to another desktop. It seems to act as if it's minimised (I have to click the taskbar icon to bring it up again).

Thanks again for your help.

I've done one more graphical optimisation for slightly higher frame rate. It won't be so noticeable because it's on a type of object that isn't very common. For any Windows 10 users who haven't followed the thread recently, this also contains fixes for Windows 10.

0.6H10 : https://www.lfs.net/forum/thread/87997

Thanks for the patch, I also tried on my laptop with an I5 4200m and Nvidia 720M and my fps's there up from 80 to 115 !!

on my desktop PC my fps's seem locked to 333 most of time, so I didn't noticed any difference from the previous versions.

how many things still todo until you go into official release ?

Quote from Dygear :

Considing the amount of joy S2 bought me, I feel like I owe you guys more money.

+1!

Great work, Scawen. All of the problems I mentioned have now gone.

even less CPU and GPU usage than before ! From now on, this is the only game I will play troughout this hot summer. Good work.

Seriously impressive. Yes, concerning content nothing changes but I think this is a great update.