# Performance Tests

### NFT-PERF-01: Single image detection latency

**Summary**: Measure end-to-end latency for a single small image detection request after engine is warm.
**Traces to**: AC-API-2
**Metric**: Request-to-response latency (ms)

**Preconditions**:
- Engine is initialized and warm (at least 1 prior detection)

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Send 10 sequential `POST /detect` with small-image | Record each request-response latency |
| 2 | Compute p50, p95, p99 | — |

**Pass criteria**: p95 latency < 5000ms for ONNX CPU, p95 < 1000ms for TensorRT GPU
**Duration**: ~60s (10 requests)

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### NFT-PERF-02: Concurrent inference throughput

**Summary**: Verify the system handles 2 concurrent inference requests (ThreadPoolExecutor limit).
**Traces to**: RESTRICT-HW-3
**Metric**: Throughput (requests/second), latency under concurrency

**Preconditions**:
- Engine is initialized and warm

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Send 2 concurrent `POST /detect` requests with small-image | Measure both response times |
| 2 | Send 3 concurrent requests | Third request should queue behind the first two |
| 3 | Record total time for 3 concurrent requests vs 2 concurrent | — |

**Pass criteria**: 2 concurrent requests complete without error. 3 concurrent requests: total time > time for 2 (queuing observed).
**Duration**: ~30s

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### NFT-PERF-03: Large image tiling processing time

**Summary**: Measure processing time for a large image that triggers GSD-based tiling.
**Traces to**: AC-IP-2
**Metric**: Total processing time (ms), tiles processed

**Preconditions**:
- Engine is initialized and warm

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | `POST /detect` with large-image (4000×3000) and GSD config | Record total response time |
| 2 | Compare with small-image baseline from NFT-PERF-01 | Ratio indicates tiling overhead |

**Pass criteria**: Request completes within 120s. Processing time scales proportionally with number of tiles (not exponentially).
**Duration**: ~120s

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### NFT-PERF-04: Video processing frame rate

**Summary**: Measure effective frame processing rate during video detection.
**Traces to**: AC-VP-1
**Metric**: Frames processed per second, total processing time

**Preconditions**:
- Engine is initialized and warm
- SSE client connected

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | `POST /detect/test-media-perf` with test-video and `frame_period_recognition: 4` | — |
| 2 | Count SSE events and measure total time from "started" to "AIProcessed" | Compute frames/second |

**Pass criteria**: Processing completes within 5× video duration (10s video → < 50s processing). Frame processing rate is consistent (no stalls > 10s between events).
**Duration**: ~120s