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Lazy Import of heavy weight modules - #5205
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Version 2.0 of PyMuPDF unconditionally also imports pymupdf-layout and pymupdf4llm. This increases the duration of the import statement by almost an order of magnitude. Applications not using 4LLM or Layout perceive this as intolerable especially when also spawning subprocesses. This fix postpones the imports of pymupdf4llm and layout until they are used for the first time. For this fix to work, the same-named branch of pymupdf4llm must also be available.
julian-smith-artifex-com
approved these changes
Oct 23, 2026
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Version 2.0 of PyMuPDF unconditionally also imports pymupdf-layout and pymupdf4llm. This increases the duration of the import statement by almost an order of magnitude. Applications not using 4LLM or Layout perceive this as intolerable especially when also spawning subprocesses.
This fix postpones the imports of pymupdf4llm and layout until they are used for the first time.
For this fix to work, the same-named branch of pymupdf4llm must also be available.