Mcollina perf improvements migration#738

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jdmarshall wants to merge 5 commits intosiimon:masterfrom

jdmarshall:mcollinaPerf

Commits on Jan 3, 2026

Enable benchmarks for Utils that have landed on trunk before
jdmarshall
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perf: optimize string escaping for better metrics serialization

mcollina
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jdmarshall
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perf: avoid array conversion in getMetricsAsJSON

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jdmarshall
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docs: update CHANGELOG.md with recent performance improvements and test migration

mcollina
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jdmarshall
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Commits on Jan 4, 2026

Start benchmarks for the default metrics.
jdmarshall
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