I have looked at the BeforeDownloadPackageAdapterBase and Users_ValidateLogin classes of the SDK but couldn't find a way to implement the following extension:
Check the provided username and password when there's an attempt to download a package and return an HTTP error or redirect to an error page.

Or will it be easier to implement a custom ASP.NET HttpModule and configure that in the ProGet web application's web.config? In that case I need to know when someone attempts to download any package and check the feed name, username and password.

Product: ProGet
Version: 3.6.1

I've read that NuGet's architecture is being redesigned for version 3.0, which should also improve the performance.

http://blog.nuget.org/20150608/nuget-server-status.html
http://blog.nuget.org/20150601/nuget-3.0-rc2.html

It takes many seconds to browse or search through a ProGet NuGet feed from Visual Studio (both proxy feeds to nuget.org and private feeds).
Sometimes we even need to cancel the search operation and retry because we get no results.

I already tried some things which seem to be an improvement:

•      Configure the IIS application pool StartMode to AlwaysRunning
  

•      Configure the IIS website to Preload Enabled = True
  

•      Check the ProGet cleanup interval: for all feeds this is a frequency of 1 day between 2:00 and 7:00. I read that ProGet reindexes feeds whenever cleanup occurs and that this slows down a lot; however nobody works between those hours.
  

•      Configure the IIS application pool Recycling Regular Time Interval. This has a default value of 1740 minutes or 29 hours. I have set this to 0.
  

•      Configure the IIS application pool Idle Time-Out: it is set to 10 minutes by default. I have set the Idle Time-Out to 0 (=never let the IIS worker process shut down).
  

•      Configure the IIS application pool Specific Times: 01:00:00.
  

Are there any other measurements I should take or do you have more advice?

I recently upgraded to ProGet 3.6.1 (Build 6) and I'm using IIS hosting and a SQL Server Express database.

Product: ProGet
Version: 3.6.1