Bundler performance optimizations: 2x faster installs#9316

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tobi wants to merge 13 commits intoruby:masterfrom

tobi:bundler-performance-optimizations

Commits on Feb 6, 2026

Decouple gem downloading from installation with two-phase pipeline
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Add clonefile/hardlink installation and reduce filesystem IO
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Pack version comparisons into 64-bit integers for O(1) comparison
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Batch prefetch dependency specs and deduplicate gem info fetches
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Replace O(n) lookups with O(1) hash lookups across hot paths
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Increase HTTP connection pool size to match worker count

tobi
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claude
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Add ignore_ruby_upper_bounds setting to skip < and <= Ruby constraints

tobi
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claude
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Use CompactVersion integer comparison in resolver and version promoter

tobi
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claude
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Add Blake2b256 fast_digest for local hashing operations

tobi
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claude
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Add binary spec cache for compact index parsed data

tobi
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claude
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Add 3-phase install pipeline with live progress reporter

tobi
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claude
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Remove batch barriers, stock UI messages, and scan pass

tobi
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claude
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Commits on Feb 7, 2026

Add global extracted gem cache and single-pass extraction
tobi
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