SQL Server Management Studio (SSMS) is way too slow in its GUI I know this question has been asked before here and here. But none of them could sovle my problem. I have this environment:


Windows 10, build 1903 (freshly installed)
Microsoft SQL Server 2016 (SP2) (KB4052908) - 13.0.5026.0 (X64)   Mar 18 2018 09:11:49   Copyright (c) Microsoft Corporation  Enterprise Edition (64-bit) on Windows 10 Enterprise 10.0  (Build 18362: )
SSMS v17.3 (14.0.17199.0)


Any activity I want to do in it, from opening, to connecting to a database engine, to right-clicking on a database, to creating a new database, to opening up a new query window, to browsing tables, any activity that is not query takes like 5 to 10 seconds to perform. It's clearly apparent that SSMS is doing something for each activity, and it gets stuck somewhere.

Here are the things I've done so far, without effect:


Blocked Microsoft's certificate URL (adding 127.0.0.1    crl.microsoft.com to hosts file)
Downloading certificate and installing it from http://crl.microsoft.com/pki/crl/products/MicrosoftRootAuthority.crl
Connecting to "local" instead of "."
Resetting user-defined settings in "C:\Users\user\AppData\Roaming\Microsoft\SQL Server Management Studio"
No antivirus is installed (only Windows Defender, the default of Windows)


It's a shame that a program from such a reputable company can't work smooth out of the box, and troubleshooting it is sooooooooooooooo difficult.

Could you please help. How can I diagnose what's wrong with SSMS.

Update: This problem exists even with SSMS v18.2 (15.0.18142.0)
I also had the mystery slow down in v14 and then upgraded to 18.5  Post upgrade 18.5 worked fast...a few days (and reboots)  later it bogged down again. Network trace showed a ton of IP6 traffic which we have not configured but somehow became a default 'on' in Windows 10.  

Disabled Ip6 on the ethernet adapter and all working fine now.