perf: lp write speed - #562

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FBumann wants to merge 11 commits into

PyPSA:masterfrom

fluxopt:perf/lp-write-speed

Commits on Jan 31, 2026

perf: speed up LP constraint writing by replacing concat+sort with join
FBumann
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ccb9cd2
fix: missing space in lp file
FBumann
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8524c29
perf: skip group_terms when unnecessary and avoid xarray broadcast for short DataFrame

FBumann
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claude
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aab95f5
perf: skip group_terms in LinearExpression.to_polars when no duplicate vars

FBumann
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claude
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7762659
perf: pre-cast rhs to String in with_columns instead of inside concat_str

FBumann
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claude
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bdbb042
bench: add PyPSA and knapsack models to LP writer benchmark
FBumann
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e9cffb4
perf: Use polars streaming engine
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44b115f
bench: increase knapsack model sizes to 100k

FBumann
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claude
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940edc7
perf: reduce per-constraint overhead in Constraint.to_polars()

FBumann
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claude
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9ac474b
Add better benchmark script
FBumann
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1919f3f
Add better benchmark script
FBumann
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ac761c0