azure-sdk-for-net: [BUG] DefaultAzureCredential takes a long time to authenticate

Library name and version

Azure.Identity 1.5.0

Describe the bug

Using DefaultAzureCredential for authentication takes a very long time in package version 1.5.0. The following code snippet takes ~3.5 seconds to run with Azure.Identity v1.4.0, and ~12.5 seconds with Azure.Identity v1.5.0.

var cred = new DefaultAzureCredential();
var result = cred.GetTokenAsync(new TokenRequestContext(new string[] { "<ValidScope>" })).Result;

Expected behavior

DefaultAzureCredential should not take >12 seconds to load credentials.

Actual behavior

DefaultAzureCredential takes >12 seconds to load credentials.

Reproduction Steps

Create an ASP .NET Core app with Azure.Identity v1.5.0 dependency. Add the code snippet above and measure the time taken for GetTokenAsync to complete. I had VisualStudioCredentials configured for authentication. Directly using VisualStudioCredentials for auth has no delay.

Environment

Tried running on .net3.1, .net5 and .net6 - same behavior. Running in Visual Studio 2019.

dotnet --info: .NET SDK (reflecting any global.json): Version: 6.0.101 Commit: ef49f6213a

Runtime Environment: OS Name: Windows OS Version: 10.0.19044 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.101\

Host (useful for support): Version: 6.0.1 Commit: 3a25a7f1cc

.NET SDKs installed: 3.0.103 [C:\Program Files\dotnet\sdk] 3.1.416 [C:\Program Files\dotnet\sdk] 5.0.210 [C:\Program Files\dotnet\sdk] 5.0.403 [C:\Program Files\dotnet\sdk] 5.0.404 [C:\Program Files\dotnet\sdk] 6.0.101 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]