There is no data about gzip compression performance for the T1020 (e5500 core). It depends on configuration and software. Some benchmark data are available on the following page:
http://www.eembc.org/coremark/index.php
There is data for the e500 core (P4080 and P2020), e6500 core (T4240) on this page. Use this page for estimation the T1020 performance.
Have a great day,
Pavel Chubakov
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