mercurial/help/config.txt

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    Large repositories using the *generaldelta* storage format should
    consider setting this option because converting *generaldelta*
    repositories to the exchange format required by the bundle1 data
    format can consume a lot of CPU.

``smtp``
--------

Configuration for extensions that need to send email messages.

29760:5e2365698d44

    Large repositories using the *generaldelta* storage format should
    consider setting this option because converting *generaldelta*
    repositories to the exchange format required by the bundle1 data
    format can consume a lot of CPU.

``zliblevel``
    Integer between ``-1`` and ``9`` that controls the zlib compression level
    for wire protocol commands that send zlib compressed output (notably the
    commands that send repository history data).

    The default (``-1``) uses the default zlib compression level, which is
    likely equivalent to ``6``. ``0`` means no compression. ``9`` means
    maximum compression.

    Setting this option allows server operators to make trade-offs between
    bandwidth and CPU used. Lowering the compression lowers CPU utilization
    but sends more bytes to clients.

    This option only impacts the HTTP server.

``smtp``
--------

Configuration for extensions that need to send email messages.