Some of these changes are happening in the runtime itself, so many projects will get benefits just by updating to a newer version (something you would have to d

Some of these changes are happening in the runtime itself, so many projects will get benefits just by updating to a newer version (something you would have to do anyway to get GC improvements). For example, System.Text.Json is the default in ASP.NET Core 3.x, updating to 3.0 would use it instead of Json.NET unless you explicitly opt-out. In the same way many APIs are starting to accept Span<T> in addition to IEnumerable<T>, Lists or arrays, so it's easy to opt-in into that. Other APIs are using it internally to avoid copies, so you don't need to do anything to get benefits.