We spent this week doing a deep architectural comparison of Sektor's editor frame against the industry's leading engines, and the conclusion is now our roadmap: the fastest editors are retained-mode - a frame where nothing changed costs almost nothing, and edits invalidate only what they touch.
The resulting milestone rebuilds foliage around a cluster hierarchy with GPU culling, caches draw submissions instead of rebuilding them every frame, adds static shadow caching so idle frames redraw near-zero shadow geometry, and introduces a content-addressed derived-data cache so the second open of a project builds nothing at all.
Each workstream ships with hard performance gates measured on a 200,000-instance benchmark scene. We will publish before/after numbers as they land.