Another Dispatch: Step 1 of 2 Complete!

A couple of notes of interest for the work over the past few days:

I'm really looking forward to finishing the work that _render_for_parts was a placeholder for. As I go through the codebase, I'm definitely noticing some obvious perf opportunities (non-trivial perf that should show up very clearly on macro-benches) and I'm looking forward to finishing the initial refactor so I can get into some perf optimizations. I should have some initial numbers within a week or so.