51a61f4b17
App::grids() memoises the named view's layout for as long as it borrows the App: once for a whole frame check, once in model_effects. A frame of n writes to another view's empty records now derives 1 + 2n grids instead of about 5n. Empty-record ClearCell on 18k cells with a formula, M4 Max: 1.44s -> 0.66s. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze