SQL server taking too much time in opening properties in SSMS
Now I'm not stating that this is the solution, but I have encountered various issues with various versions of SQL Server Management Studio if SSMS cannot retrieve Microsoft's Certificate Revocation List from the internet. When SSMS starts or runs various commands, it can display slow performance.

Solution

Downloading the MicrosoftRootAuthority.crl file from the following location and installing it into your trusted certificates, can alleviate some of the issues surrounding SSMS and slow performance.

https://crl.microsoft.com/pki/crl/products/MicrosoftRootAuthority.crl