vendor-xxxxx.js loading slowly for Seq hosted on Windows servers

[larenelg]

Describe the bug
vendor-xxxxx.js taking longer than 30 seconds to load for customers with Seq hosted on Azure Windows VMs.

To Reproduce
Steps to reproduce the behavior:

1. Spin up a new instance of Seq on an Azure Windows VM.
2. Navigate to your Seq url.
3. Open browser developer tools.
4. See vendor-xxxxx.js loading for at least 30 seconds (~800kb)

Expected behavior
Even though the size of vendor-xxxxx.js is relatively large, it should only take 1-2 seconds to load, at the most.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: Windows
• Browser All
• Seq Version 2020.3, 2020.4
• Using Docker? No

Additional context
Problem seems to be related to using http.sys and using Response Compression in ASP.NET Core.
dotnet/aspnetcore#14455

[nblumhardt]

We're converting this to a discussion to track until we get an update on the upstream ticket.