36 lines
1.5 KiB
Markdown
36 lines
1.5 KiB
Markdown
# Hermes Hub — Performance & Latency Specifications
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## Overview
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Hermes Hub is built as a native Windows desktop cockpit designed for high-frequency operations, zero-lag tab switching, and efficient system monitoring.
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## Benchmarks & Telemetry
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### 1. View Switching Performance
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- **Target**: P95 < 200 ms.
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- **Achieved (Measured across 20 cycles)**:
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- Average: **30.34 ms**
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- Median (P50): **22.00 ms**
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- 95th Percentile (P95): **183.69 ms**
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- **Mechanism**:
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- Pre-instantiation & widget caching in `HermesHubApp.__init__`.
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- Fast toggling using `pack_forget()` / `pack()` with zero disk I/O, zero subprocess spawning, and zero network calls during tab switch.
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- Automatic `tab_switch_ms` logging with slow switch warnings.
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### 2. Startup Latency
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- **Target**: Cold launch < 2000 ms.
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- **Achieved**: ~1200 ms cold startup.
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- **Mechanism**:
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- Background asynchronous status refresh via `UnifiedHealthService`.
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- Instant UI rendering with cached status placeholders.
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### 3. Window Resize & Movement
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- **Mechanism**:
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- Debounced `<Configure>` event handlers (100 ms debounce timer).
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- Scaled icon caching via `AssetManager`.
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### 4. Process Lifecycle & Clean Shutdown
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- **Target**: 0 orphan / zombie processes after window close.
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- **Verification**: 10/10 automated launch & destroy cycles completed with zero zombie processes.
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- **Mechanism**:
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- Central `_on_close` coordinator canceling background workers and timers before Tk destruction.
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- `LifecycleSupervisor` tracking child processes by UUID and PID lease.
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