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priority: high
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- Cache OCR results: key = hash(image_bytes + language + config)
- Invalidate cache when OCR config changes (backend, language, PSM mode)
- Batch processing: process multiple images concurrently with configurable parallelism
- Resource management: limit concurrent OCR operations to avoid memory exhaustion
- Performance targets: <2s for single page, <10s for 10-page document
- Monitor and log OCR processing times for regression detection