# Perf Recon P1 — RUNTIME / DISPATCH / ROUTER Hot Paths

**Date:** 2026-06-10  
**Scope:** 7 target files, read-only scan  
**Method:** Per-turn / per-node / per-route hot-path analysis for complexity > O(n) or avoidable repeated work.

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## Ranked Findings (Impact High → Low)

| Rank | File:Line | Hot-Path Justification | Current Complexity | Concrete Behavior-Preserving Fix + Expected Gain | Risk |
|------|-----------|------------------------|-------------------|--------------------------------------------------|------|
| **1** | `src/orchestration/routing.ts:760` | `textMatchesKeyword` recompiles `new RegExp(...)` **on every call**. Called from `scoreRoute` (line 544) for every keyword of every route candidate. With ~25 static+dynamic candidates × ~6 keywords each = **~150 regex compiles per `selectTaskRouting`**. `selectTaskRouting` is invoked **per DAG node**. | O(k × regex_compile) per node | **Cache compiled RegExp objects** in a module-level `Map<string, RegExp>` keyed by `normalized` keyword. Reuse on every subsequent call.  <br>**Gain:** Eliminates ~150 regex compiles per node. Typical saving **5–15 ms/node**, scales linearly with DAG width. | **SAFE-ISOLATED** |
| **2** | `src/goal/control-loop.ts:1144–1148` (+ 531, 389, 401) | `generateNextPromptInner` performs **6 separate `.filter()` passes** over `runState.nodes` (failed, blocked, running, pending, success). `evaluateGoalProgressDelta` adds 2 more filters (blockedNodes, repeatedFailures). All executed **per control-loop iteration** (per turn). | 6–8 × O(n) per iteration | **Single-pass classification:** iterate `runState.nodes` once, push each node into typed buckets (`failed[]`, `blocked[]`, etc.). Return a buckets object consumed by downstream logic.  <br>**Gain:** 6–8× reduction in node-array scans. Dominates prompt-generation CPU when n > 50 nodes. | **SAFE-ISOLATED** |
| **3** | `src/runtime/runtime-router.ts:691` | `compareRuntimeCandidates` comparator calls `computeRuntimeCapabilityScore(a, intent)` and `computeRuntimeCapabilityScore(b, intent)` **inside `.sort()`**. Invoked **O(r log r) times** per `selectByIntent` (once per node/turn). The function iterates over `INTENT_CAPABILITY_WEIGHTS[intent]` (4–8 entries) per call. | O(r log r × c) per route | **Precompute capability scores** for each `(runtime.id, intent)` pair into a `Map<string, number>` before sorting. Comparator becomes a constant-time Map lookup.  <br>**Gain:** O(r log r × c) → O(r log r). At r = 10 runtimes, saves ~50–100 capability scans per turn. | **SAFE-ISOLATED** |
| **4** | `src/runtime/router-v2-scoring.ts:129` | `score()` sorts `recentFailures` with `localeCompare` then `.slice(0, 5)`. Called **once per candidate** in `select()`. Only the top-5 most recent failures are needed. | O(c × f log f) per select | **Replace `filter + sort + slice` with a single linear scan** that tracks the 5 most recent failures (or sort once before the candidate loop and reuse the sorted list).  <br>**Gain:** Removes redundant small sorts. For c = 10 candidates, f = 20 failures, saves ~10× unnecessary sorts per select. | **SAFE-ISOLATED** |
| **5** | `src/runtime/context-broker.ts:53` | `collectDependencySummaries` uses `state.nodes.find((n) => n.id === depId)` **inside a loop** over `node.dependsOn`. Called per `buildCapsule` (per node execution). | O(d × n) per node | **Build a `Map<string, DagNode>`** from `state.nodes` once per capsule build, then `map.get(depId)` in O(1).  <br>**Gain:** O(d × n) → O(d). For a 100-node DAG with avg 3 deps, saves ~300 find ops per node. | **SAFE-ISOLATED** |

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## Honorable Mentions (Lower Impact)

- **`src/runtime/runtime-router.ts:101–111`** — `classifyIntent` uses regex literals (compiled once at parse time, **not** per call). No action needed.
- **`src/orchestration/routing.ts:620,657,676,682`** — `Array.includes()` on tiny constant arrays inside loops. Arrays are ≤ 10 elements; impact is negligible.
- **`src/providers/provider-task-runner.ts:1367`** — `summarizeRouteEnsemble` does map/join on candidates. Called once per route decision; not a governing hotspot.

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## Files Scanned

- `src/runtime/tool-dispatch-contracts.ts`
- `src/runtime/router-v2-scoring.ts`
- `src/runtime/runtime-router.ts`
- `src/orchestration/routing.ts`
- `src/providers/provider-task-runner.ts`
- `src/goal/control-loop.ts`
- `src/runtime/context-broker.ts`

