If antivirus solutions such as Avira are present on the system, the explanation could be these tools (see also my blog post AVAST and Avira confirms April 2019 Update issues). Avira has now confirmed exactly this slowdown in an article. It says there:
AVAST and Avira confirms April 2019 Update issues
In this support post there is an addendum dated 24 May 2019 from Sophos addressing the tweet above. Microsoft may have found the cause. Customers running Windows Defender ATP on Windows 7 or Windows Server 2008 R2 may experience sporadic issues installing Windows updates. Microsoft is aware of the issues and will introduce a fix for Windows Defender ATP in the next 36 hours. No customer action is required. The fix is applied automatically by the Microsoft Monitoring Agent Service.
Microsoft has confirmed that the April 2019 cumulative update is not playing well with some PCs. On Tuesday, fondly referred to as Patch Tuesday, Microsoft rolled out the April updates to Windows 10, 8.1, and 7 machines. As has been the case recently, it didn't take long for the updates to cause performance issues.
On April 9th, 2019, Microsoft released their April 2019 Patch Tuesday updates and since then users have reported performance issues and freezes in Windows 7, Windows 8.1, Windows 2008, Windows 2008 R2, Windows 2012 and Windows 2012 R2.
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