Whole bunch of performance optimizations coming in.

[Lucasharskamp]

See https://learn.microsoft.com/en-us/aspnet/core/blazor/performance?view=aspnetcore-8.0#optimize-rendering-speed

I'm adding them to increase rendering speed and loading speed of pages, since we're dealing here with small items that get used over and over again. Please go through my PR #747 and keep in mind I'm sending a new batch over for 3.0-preview.