ikiwiki/doc/todo/optimisations.mdwn

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Ikiwiki has already been optimised a lot, however..
* Look at splitting up CGI.pm. But note that too much splitting can slow
perl down.
> It's split enough, or possibly more than enough, now. :-)
* The backlinks calculation code is still O(N^2) on the number of pages.
If backlinks info were stored in the index file, it would go down to
constant time for iterative builds, though still N^2 for rebuilds.
> Seems to be O(Num Pages * Num Links in Page), or effectively O(N)
> pages for most wikis.
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