# Poor Dhrystone performance

**URL:** <https://forums.sifive.com/t/poor-dhrystone-performance/233>\
**Category:** Freedom E300\
**Created:** [January 1, 2017, 5:28pm UTC](https://forums.sifive.com/t/poor-dhrystone-performance/233 "2017-01-01T17:28:49Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![dagema](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.sifive.com/dagema/32/59_2.png) [@dagema](https://forums.sifive.com/u/dagema)\
**Post date:** [January 16, 2017, 1:34pm UTC](https://forums.sifive.com/t/poor-dhrystone-performance/233/13 "2017-01-16T13:34:41Z")

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I am really a dummy here but, do not both -O and -Os ignore any -O2 optimizations which “typically increase code size” and/or those that take " a great deal of compilation time" ?

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