win 10 / direct X 12

I have old 4-core CPU with good GPU. GTA V was lagging on Win8.1 because the CPU was all the time 100% with GPU 60-70%. On the Win10 i don't have lags, FPS is more stable.

You will see a small improvement only if you are limited by the CPU. But... that improvement fades away very quickly because (In my case) alt tab in/out of games is slower , a lot of games don't work properly [GTA IV needs a lot of tinkering , Borderlands 2 is an absolute nightmare (enters main menu in 1.5 min , loads up the map in 1 min ... , on W7 it was 1 min from desktop to map) . Skype acoustic echo cancellation isn't working . In GTA V I didn't see that much of a difference , maybe a 5-10% increase in "FPS smoothness".] <- Maybe all of them are specific to my computer , I'm not sure . But , I'm sure that once I upgrade my PC next month I will not install Windows 10 , I will wait M$ to fix some things .
Also , they don't have Clash of Clans on the M$ Store , WTFFFFFFFFFFFF .

** I like that Windows 10 already had a lot of drivers ready from the start . On W7 I must install the Internet driver :| , that's a pain in the......

Nobody knows how big the impact of DX12 is going to be. It's not even available yet. However W10 already gives a small improvement in gaming performance.

My reg:
GPU: Gtx 660 3gb oc
CPU: i5-4440
Ram: 8Gb
Performance on win 8.1
AC:Unity (Ultra-1080p-FXAA) 27-32fps
The Witcher 3 (ULTRA-AA-1080p-low rendering distance) 30fps
On win 10
Ac:Unity (same settings) 30-40Fps
The Witcher 3 ( same settings with high rendering distance) 27-35fps
so yup there's actual improvement not too much as you can see but these 5-10fps made my gameplay more stable with less frequent frame drops on demanding games.

I really cant believe that. Why should old games in dx9 or dx11 get faster under dx12 ?? Older games will never get dx12-support and windows-10 isn´t supporting dx-5 so very old (but good) games like commandos-1,2,3 wont run

There's a performance increase in rigs that have a GPU with FULL or PARTIAL support for Dx12.
Basically new GPUs will work better than their non-dx12 counterparts, semi-new GPUs with partial support may or may not have a slight performance incrase, older GPUs won't have any performance increase.

That's what I know :D

Win 10 have shitload of problems but performance ain't one. It literally saved me from buying a new CPU, mine was going %100 on all games ( I use an AMD 1075T X6 @3.38 GHz), then randomly drop %1 usage and lag in every single game I own. Win 10 solved my issue AND I got a FPS boost in all of my games. It was probably the new AMD drivers that increased FPS but hell, I had no problems on W10 so far.

I upgraded to 10 a couple weeks ago, I have not noticed any changes in performance either good or bad. Basically the performance is exactly the same as when I was using 7. I do recommend upgrading though, 10 is great and has many new features. The majority of video card manufacturers have a windows 10 driver out. The only problems I have had is that one of my older games doesn't run at all on 10, Risen. It's weird because I have much older games that do work, such as Doom, Quake, Unreal Tournament '99, etc...

Gaming wise, performance is pretty much the same, the OS though, does feel smoother IMO. I also like some of the new features and improvements.

Windows X master race.

I'm sticking with win 7 because in win 10 i wont be able to pick and choose the updates I install because it's Home premium and in Win 10 Home versions you have no control, you get every update automatically installed even if it breaks you PC like some of the Win 7 updates did.

I also want to see if Nvidia actually hold true to there word about DX 12 support from all GPU's from the 400's on warders I'm holding off getting a new GPU in the hopes that Pascal is going to make me wan to pony up cash lol Current offerings from the 600 700 and 900 range just don't appeal to me.

For winfail 10 i recommend this tool for blocking m$ sniffing around. https://dl.dropboxusercontent.com/u/85556593/SDCutTheLine.exe (made by ppl who made spybot search & destroy anti malware :p)

What about CPU intensive games, like EU IV and CK II by Paradox?

Planned obsolescence sucks.

If I had the means, I would have a dual-boot Linux/Win7 system.

Well, I can play shogun 2 on high 25-30 fps with intel hd 4000 on win 10. So thats pretty good

Imo windows 7 is the best and most organized OS

On My Personal Experience with Windows 10 , they do Actually improve my Rigs speed both on Gaming and both on Startup of my System .
When I had windows 7 it took like 1 minute from the time I pressed to power button till I would be able to star the Internet Browser or Open Steam , but with Windows 10 I can do the same thing in 10-15 SECONDS ! That's Amazing and i'm not done yet ,
from what I have observed using my Nvidia FPS tool I've gotten like 5-10 Fps Increase on most games witch might not sound much but it's a Huge improvement on Low-end computers like mine !
So . . . Definitely Windows 10 !
Hope I Helped you ! ^_^

I own Windows 10 on 2 PCs. On my desktop performance of overall things (not only games) was improved. But games too. But... there is no games with directx12 yet, so it will be even better when they start enabling dx12 in games.

In conclusion...

1. Windows 10 without dx12 is better than Windows 8.1 (which is better than 8, which is better than 7).
2. They will enable dx12 in games in the future so games will have improved performance even more than it's currently

But You have to know:

1. Windows 10 has some bugs and errors.
2. Many people encountered big problems.
3. I had to give my PC to service and they said my BIOS wasn't compatible with Windows 10 (I bought my PC december 17, so not even a year ago).
4. Windows 10 is great but You really have to know about problems with it. You can do that already or wait a bit.

Few things about Windows 10:

1. You have menu start back.
2. You can pin tiles to menu start like on start screen from Windows 8.
3. You can even use start screen instead of menu start.
4. It has few nice options, e.g. action center which is pretty good.

And generally I like Windows 10. Despite that problems You can encounter, it's really good system. At least for normal user, that don't regularly do complex things with system. I just use it for Internet, music, games etc. So... I don't know what it looks like when You use it more advanced.

For me performance wise, it has made a significant difference. I use a performance monitor and I took some notes of before and after to see exactly how well or worse windows 10 performed. I used to have everything turned off on windows 7 so I could optimize my usage experience, and now even with everything turned back on and with windows 10 doing what it does to keep you connected to all of your accounts it still runs faster than windows 7 for me. I would recommend you give windows 10 a try as you can revert back to windows 7 anytime you wish within 30 days if you dislike it for any reason.

10-20% improved performance??? or, 10-20% of your game library never going to work again when you install win10?
LOL