Windows 10 1809 Benchmarks. The Spectre patch kills performance.

To disable Spectre, I used this tool from Gibson Research, whom I am assured are a respectable organisation who specialise in this sort of thing.

https://www.grc.com/inspectre.htm

Kol12 said:

That would disable all of Microsoft's Spectre and Meltdown patches in the OS would it?

That's what it says it does, my only means of testing this is to run my benchmarking tool and note the increased performance.

And, of course, you can enable the patches again once you're done. Reboot the machine each time the patch is enabled or disabled.

Kol12 said:

So was your increased performance significant?

See the first post in the thread. I've repeated this test on a different machine (which was much quicker with 1809) for some reason. It's all new hardware (i7 4790, i7 4770); I've read suggestions that older CPUs are more vulnerable to slowdown.

This is an in house benchmarking tool for our CAD application; it's is an old MFC app. that uses GDI to draw things. What I understand is that GDI uses alot of system calls that are much more prone to being slowed down by the Spectre patch. More modern apps and games that use hardware accelerated graphics / directx / opengl are less likely to be hit by the patch.

That said, I'm getting a 30%-40% decrease in performance which is pretty dire.

Oh, 40% quicker benchmarks when the Spectre patch was disabled. Might be worth waiting for the release build before coming to a firm conclusion though.

No this is only on 1809.

It's just occurred to me that the Spectre patch is already delivered to some Windows versions, so linking 1809 with Spectre is unhelpful.

Bottom line - spectre patch makes my app benchmarks run 40% slower.