An amendment: the problems I had been having have not persisted. More recently, perhaps after a number of Windows updates, my system seems stable. The games I enjoy now seem to run, dare I say, better in Win 10 than ever. Like XP, Win 7 and other OS's I suppose software updates address these nagging problems. Thanks to anyone that tried to help by replying to this post.

Accidentally hit the download button, now I'm stuck either updating or uninstalling. League download speed: "Oh damn, my.

I am (was) also having the same issue. Not lacking in horsepower with a Falcon Northwest PC and twin video cards after upgrading to Windows 10 all my games that ran flawlessly in Windows 7 are now almost unplayable, even with the latest GeForce Experience (NVidia) drivers and after hours of research, reinstalling drivers and tinkering nothing has helped. After the Win 10 update GeForce settings that were by default high are now low by default and fps are dismal on anything but the lowest graphic settings. I like many aspects of Win 10 - this is not one of them.

Windows 7 Will Not Update After Fresh Install

As an addendum, it would seem with the latest GeForce settings, I may have overacted and only a couple of my apps/games are choppy. I very much like many aspects of Windows 10 and apologize for over reacting and making an absolute statement claiming all games are unplayable. Like so many previous operating systems it takes time to level the playing field. The success of Windows XP and Win 7 didn't happen overnight and I expect Windows 10 to also be great.

Oh god finally. As others here I had a really hard time narrowing down the problem. I re-installed Windows (well, the laptop had also gotten infected with malware, so it was not that big of a deal) and was about to hand it in and try to get my computer fixed through my warranty. But it seemed so much like to a software error so what would they do? They would just reset it and the problem would still be there. After at least an hour of searching the web and trying different things, I found this thread.

League Patch Download Speed After Fresh Install Slow Boot

The error occured when I plugged in or unplugged my second monitor that had a different DPI setting (I did not figure out DPI mattered until I read the comments here, and changing them both to 100% it issue was gone). And sometimes seemingly just randomly. Turning on the TimerCheck option did not fix it. But with the build you posted here I can happily say it works.

As Jadelor said, you might want to make this build available on the offcial page. Perhaps display a warning in the installer or something.

League Patch Download Speed After Fresh Install Slow Windows 10

Here is my system information:
https://hastebin.com/iboganilun.cs