ext/imgmath: batch LaTeX compilation - #14535
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July 17, 2026 08:42
Add ``imgmath_batch_size`` config option (default 1). When greater than 1, equations are collected on ``env-updated`` and compiled into multi-page DVI documents before writing, reducing N LaTeX processes to ceil(N/B), then split via ``dvipng -pp`` / ``dvisvgm --page``. Filenames, embed mode, depth handling, and error reporting match single-equation mode. Batching is disabled when a custom ``template.tex``/``preview.tex`` template is detected.
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Add
imgmath_batch_sizeconfig option (default 1). When set to a value greater than 1, equations are accumulated and compiled in a single LaTeX invocation using a multi-page DVI withpreviewenvironments, then split viadvipng -page/dvisvgm --page.For a build with N equations and batch_size=B, this reduces N LaTeX process launches to ceil(N/B), keeping resource usage manageable.
For the openturns project (with 8k+ equations), this reduces the sphinx build time from 22m30 to 10m25 (with imgmath_batch_size=128)