Update about FASTEST Windows 10 builds for normal hardware / Fanless devices / NUCS / Lowend hardware (max speed and the less LAG you can get without a dedicated graphic card; yes, running Intel Graphics ) :
What I say about 1507 and 1607 it's not 100% true. Best version (after 10074) it's probably 1511 (10586), it's an improved version of the previous w10 version (10240).
It doesn't update WDDM to 2.1, instead of it improves wddm 2.0 and memory management. At the end you get better disk usage and smooth GUI with less lag.
How can you choose the perfect W10 version for lowend hardware? Use the XP era thinking when Windows 2003 appears.
You could say "it has no sense to use one build or another if the Windows Server version has the same kernel version nowadays" This is the starting point
In other words, fastest w10 Workstation editions shares the kernel version with the Windows Server edition. So now I can really understand why 10074 and 10586 are faster builds than 10240 (and also 1607 (14393), but it's the first one I started to hate because it has metro more integrated and lot of new things).
Kernel version 10.0.X and Server build equivalence
10074 = Server 2016 Technical Preview 2 ( ¿Windows 8.2? )
10240 = NO SERVER VERSION ONLY WORKSTATION RTM ( slow + lot of hdd usage in RTM ) Threshold 1
10514 = Server 2016 Technical Preview 3 ( I didn't tried this build but as you can see this server build is really close to 10586 TP4 )
10586 = Server 2016 Technical Preview 4 ( Windows 10 November update Workstation kernel version ¿Windows 8.2 SP1: Service Pack 1? ) Threshold 2
14393 = Server 2016 RTM build ( After this one, all builds are pure Windows 10. You won't get Windows 7 / 8 / 8.1 experience anymore. In other words, starting with 1607 14939 builds are a little heavy for HDDs. 1607 it's not bad but some classic windows shell is removed, metro is more integrated, windows updates can't be controled as easy as in RTM and November update (10240-10586), WDDM version changed to 2.1 in this build so.. more things introduced )
WARNING
To get the best speed of your CPU, make sure you have Disabled Meltdown and Spectre (these cpu protections are intended for servers running windows)
_ttps://www.grc.com/inspectre.htm
AND ALSO:
If you want to get fast speed on every build starting with 1607 make sure you have Control Flow Guard disabled too (kernel 14393)
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Another interesting script I recommend which really make a difference:
Remove-Windows10-Bloat.bat by matthewjberger
https://gist.github.com/matthewjberger/2f4295887d6cb5738fa34e597f457b7f
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And also, what REALLY makes a difference it's DWS (Destroy Windows Spying) utility
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+ Windows Defender & Cortana disabled of course.
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Get rid of Metro UI: rename c:\windows\system32\windows.immersiveshell.serviceprovider.dll to anything else and restart explorer.exe
NOTE:
All this information is based on a personal appreciation after I tried Windows 10 different versions on 4 different hardware configurations and compared the experience to the same hw running w7,w8 and w8.1