Optimizing programmatic PDF rendering and generation with libraries like pdf-lib, iText, PDFKit, or similar engines requires balancing memory management, asset compression, and structural cleanup. 1. Pre-Compress and Downsample Images
Images contribute the largest percentage to a PDF’s overall file size.
Action: Compress images using tools like Pillow or ImageMagick before embedding.
Rule: Target 72 to 150 DPI for digital viewing, saving high-resolution assets strictly for print workflows.
Format: Use JPEG for photographs and PNG/ZIP for flat vectors or text graphics. 2. Implement Font Subsetting
Embedding entire font sets (like large TTF/OTF files containing thousands of unused glyphs) causes immediate document bloat. PDF optimization · Issue #54 · Hopding/pdf-lib – GitHub
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