https://www.theregister.co.uk/2018/09/13/net_core_22/

Microsoft flung out updates to more of its development tech last night. It's almost as though there's a big conference coming up.

.NET Core 2.2 got a bump to preview 2, which introduced little in the way of new functionality but did switch on tiered compilation. Tiered compilation was an option in .NET Core 2.1 and promises boosts in start-up and steady-state performance. The theory is that .NET can have multiple compilations for the same method, which can then be hot-swapped at run-time depending which works better.