Local CPU-only OCR Benchmark: The Engineering Trade-off Between Speed and Accuracy
coolbro1001 · reddit · 2026-08-12
A developer benchmarked various local OCR tools on a CPU-only Ryzen 7 8845HS mini PC for sensitive documents. The core dilemma is that fast tools severely drop accuracy on degraded scans, while accurate tools are too slow for batch processing.
Benchmark Results (sec/page):
- RapidOCR: Extremely fast (0.6s) but accuracy drops to 79%-96% on degraded scans, with digit swapping errors.
- PaddleOCR: Perfect accuracy but very slow (8.5s).
- Qwen 2.5-VL 7B / 3B: Highest accuracy but takes 27-40s/page on CPU, with occasional deadlocks, making it unviable for batch tasks.
The author notes that bridging this gap is difficult under strict local-only constraints without cloud APIs. They seek community advice on finding a CPU engine that balances PaddleOCR's accuracy with faster speeds, and whether Windows iGPU/NPU acceleration is viable.
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