ModxI found this gem from ZAP in the MODx forums. The conversation was related to performance issues that some users experience secondary to a large MODx Evo site cache.

In order to assess your page/site performance just place the code below into your page and then view the rendered source code.

<!-- Queries: [^q^] | Query Time: [^qt^] | Parse Time: [^p^] | Total Time: [^t^] | Source: [^s^] -->