Asynchronous project loading no longer serves any purpose.

[CyrusNajmabadi]

Async project loading perf has taken a nose dive. Specifically, while loading VS is totally unusable due to UI thread hangs. As such, actually asynchronously loading serves no purpose. I still have to wait for hte entire solution to load.

[CyrusNajmabadi]

Tagging @Pilchie

[Pilchie]

I believe that the VS Platform project and solution team (@huizhonglong, etc), are already investigating disabling it.

[sharwell]

This issue seems a bit misleading to me. The problem we're experience is due to the legacy project system not actually allowing the projects to load asynchronously, but instead forcing them to load synchronously on the UI thread. The main point where I observed this occurring is due to the problem described in #2119, which apparently is in the process of being resolved by adding a fast path for OpenOutputGroup that doesn't require a build.

[huizhonglong]

We're doing A/B experiment on disabling ASL. @IlyaBiryukov

[IlyaBiryukov]

Experiment details

[davkean]

Going to close this in lieu of specific issues:

• Output group is known and has since been fixed.
• Long design-time builds is being tracked by [Tracking] Overhead of SDK build targets is too high for design-time builds sdk#1496