It seems like updates described in the KB3057134 make PowerShell to start slow

Starting this morning it takes 3-4 seconds to start even very simple PowerShell script on my machine. This command shows 3.2-3.4 seconds on my machine and only 0.4 second on co-worker's machine.

powershell ( Measure-Command { powershell "Write-Host 1" } ).TotalSeconds

I know there are thousands of possible reasons (including viruses!)... But I don't see any suspicious activity on my machine, and I've installed a bunch of Windows updates this morning, and it was the only significant change in my environment.

I'm wondering if anybody has the same problem.

It seems like updates described in the following KB article lead to the problem:

https://support.microsoft.com/en-us/kb/3057134

I uninstalled these updates and the problem disappeared, I installed them again and the problem came back (tested both on Win 8.1/PS4 and Win 7/PS3).

Thank you all guys for your suggestions!