If this can be implemented so that the highlighting happens after a node has been created/edited, and the result can be cached as HTML, the impact on the site's performance should be neglectible.
I would like to recommend to let the author decide whether or not a piece of code should be highlighted (i.e. not make it configurable in the User Settings). The reason is that syntax highlighting tools are not always perfect. Sometimes highlighting makes the code look really bad. (Moreover, <code> tags don't always contain Perl code.) If the author notices that, they can choose to either reformat the code or disable the highlighting.
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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