We have done some performance tests on a Void website filled with 50 static pages (10 of them displayed in topmenu) and 500 blog articles : the average PHP generation time, on our low-end 5€/month server, is:

• between 0.003 and 0.016 seconds for static pages or single article display
• between 0.020 and 0.045 seconds for the display of the blog page (showing 10 articles at a time)

For this actual website thisisvoid.org, I always get < 0.015 seconds generation time, both for blog and pages.

This is pretty decent, compared to other CMS performances.

Of course, if you have a high traffic site (several 100.000 pageviews per day), you can add caching with an exernal tool.