Steps

Make the Caching Code Macro highlight the code while the page is rendered, instead of in the background. The result is still cached.

1. Add the following line to the WEB-INF/xwiki.properties file of your XWiki installation:

   codecached.async = false

2. Restart XWiki.
3. Open a page holding a code macro that was never displayed before. The highlighted code is shown with the page, without a delay.

   

FAQ

How do I go back to the asynchronous rendering?

Remove the line, or set it to true, the default, and restart XWiki.