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# Optimizing Emacs Lisp Code
Dmitry Gutov

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[[!table header="no" class="speaker-details" data="""
Name pronunciation: | d-MEET-ri GOO-tov
Pronouns: | he/his 
Homepage: | <https://github.com/dgutov/>
Preferred contact info | <dgutov@yandex.ru> 
"""]]

-   Before optimizing, benchmark first.
-   Different benchmarking approaches.
-   Live evaluation, step-debugging, measuring from a debugger breakpoint.
-   How to determine if a function is expensive. How to pick one from
    competing alternatives (cl-lib, seq, dash, lean core).
-   Print-benchmarking.
-   Byte-compiled code can give a very different picture, changing where
    the bottleneck is. How to quickly load a byte-compiled version.
-   Steps taken to speed up the Xref package recently.

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