ShadowRealm DOM MFE

Direct No ShadowRealm — renders the same component straight through react-dom. Benchmarks are populated as the pure-React baseline; realm-only phases (serialize / deserialize / crossing / struct / paint-gap) are 0 by construction, so the comparable signals are commit count, DOM-op count, peaks and budget math.

⚡ ENVIRONMENT / PRE-BOOT Before TB0 · browser init + extension injection · not MFE runtime Overhead: — ms

				ms		ms
Nav→TB0	Extension / Env Overhead external · not MFE work	—		—		ms

⚡ BOOTSTRAP Populated once on first commit · TB0 → TB6 Total: — ms

				total	ms
TB0→TB1	Realm Create new ShadowRealm() + bridge	—		—	ms
TB1→TB2	DevTools Setup bundle fetch + eval + init()	—		—	ms
TB2→TB3	Bundle Load importValue + parse + eval	—		—	ms
TB3→TB4	React Init mfe-entry init() + first reconcile	—		—	ms
TB4→TB5	Crossing serialize + membrane transit	—		—	ms
TB5→TB6	1st Commit struct (P6a) + imperative (P6b)	—	ops	—	ms
├─ P6a	Structural Mutation DOM changes · data updates	—	ops	—	ms
└─ P6b	Browser Intents focus · scroll · select	—	ops	—	ms

⏱ RUNTIME Cumulative · T0 → T6 Commits: 0 · Avg/op: — ms

			total	avg	ms
T0→T1	Realm Reconciliation React diff inside ShadowRealm	ops	0.00	—	ms
T1→T2	Serialization ops array → JSON string · 1× per commit	commits	0.00	—	ms
T2→T3	Membrane Transit 1× per commit · ⚠ approx — hover for details	commits	0.000	—	ms
T3→T4	Deserialization JSON.parse on host · 1× per commit	commits	0.00	—	ms
T4→T5	Structural Apply DOM changes · data updates	ops	0.00	—	ms
├ DOM	DOM ops tree-shaping mutations	ops	—
└ Data	Data ops value-shaping mutations	ops	—
T5→T6	Browser Intents focus, scrollIntoView, selectText…	ops	0.00	—	ms
└ focus	Element.focus() can trigger forced layout	ops	0.00	—	ms
└ scroll	scrollIntoView()	ops	0.00	—	ms
└ select	input.select()	ops	0.00	—	ms
T6→Paint	Commit-to-Paint Gap rAF delay	samples	0.00	—	ms
Idle: Debounce	Debounce Wait idle	samples	0.00	—	ms

🔺 SPIKE Worst single commit seen · resets on HMR Commit #—

				worst	avg
Peak Ops	Max ops in one commit DOM + data + intents	—	ops	—	—	ops avg
Peak ms	Max structural apply time worst single commit	—		—	—	ms
Peak realm	Max realm reconciliation time worst single commit	—		—	—	ms

⚡ 16.6ms Frame Budget Computational latency vs 60fps budget (runtime-controlled, excludes commit→paint gap) · see T6→Paint row for paint gap Overruns: 0 · Compliance: 100%

				current	avg	ms
T0→Paint	Total Pipeline end-to-end per commit · 16.6ms budget	—		—	—	ms
Peak Compute	Peak Blocking worst single commit · runtime work only	—		—	—%	ms

📊 COMMIT HISTOGRAM Distribution of ops-per-commit · all commits since mount 0 pending action

ops/commit

1–10

—

11–30

—

31–100

—

101+

—

ms/commit

<1 ms

—

1–5 ms

—

5–16 ms

—

>16 ms

—

Total ms

≤16.7

—

16.7–33

—

33–50

—

>50

—