#10405 feat: Use lazy imports in the Meltano CLI (Python 3.15+) Pull request opened by edgarrmondragon on <!date^1792429608^{date_short}|2026-10-19T17:06:48Z> Description $ hyperfine \ --warmup 3 --min-runs 20 \ -n "No Lazy" --prepare 'uv venv -c -p 3.14 .venv && uv pip install --python .venv/bin/python .' ".venv/bin/meltano --help" \ -n "Lazy" --prepare 'uv venv -c -p 3.15 .venv && uv pip install --python .venv/bin/python .' ".venv/bin/meltano --help" Benchmark 1: No Lazy (20 runs) mean ± σ min … max Wall Time [s] 5.183 ± 0.238 4.859 … 5.731 Memory [MiB] 115.5 ± 3.5 106.6 … 120.6 Benchmark 2: Lazy (20 runs) mean ± σ min … max Wall Time [s] 4.234 ± 0.163 3.969 … 4.508 -18.3% Memory [MiB] 107.1 ± 3.3 101.5 … 112.8 -7.3% Checklist • I have read the contribution guide Was generative AI tooling used to co-author this PR? No Related Issues • Closes #XXXX Summary by Sourcery Improve Meltano CLI startup performance on Python 3.15+ by enabling lazy imports and tracking import-time regressions. New Features: • Add Python 3.15+ lazy-import support across Meltano CLI modules to reduce startup overhead. • Add CodSpeed import benchmarks for the CLI and version command. Enhancements: • Reduce CLI startup time and memory usage by deferring nonessential imports. CI: • Improve benchmark workflow change detection, required-job handling, and merge queue integration. Tests: • Add automated import performance measurement alongside existing benchmarks. meltano/meltano