Have a look into /usr/lib/rpm/macros:
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| # Compression type and level for source/binary package payloads.
# "w9.gzdio" gzip level 9 (default).
# "w9.bzdio" bzip2 level 9.
# "w7.xzdio" xz level 7, xz's default.
# "w7.lzdio" lzma-alone level 7, lzma's default
#
#%_source_payload w9.gzdio
#%_binary_payload w9.gzdio
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binkernel.spec中加入
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| %_source_payload w5.gzdio
%_binary_payload w5.gzdio
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略微降低压缩率，大大提高打包速度。kernel增加600K，debuginfo增加3M，时间从14分钟降至2分钟内
