stream-clone: disable gc for `_entries_walk` duration The number of small container created turn Python in a gc-frenzy that seriously impact performance. This significantly boost performance. The following number comes from a large private repository using perf::stream-locked-section: base-line: 35.04 seconds prev-change: 24.51 seconds (-30%) this-change: 20.88 seconds (-40% from baseline; -15% from previous changes)

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import sys

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for line in sys.stdin:

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    if line.lower() in ("message-id: \n", "in-reply-to: \n"):

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        line = line[:-2]

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    print(line, end="")