Hey Grav fans,
We tested the performance of Grav 1.3.10 on 5 different engines (5.6, 7.0, 7.1, 7.2, & HHVM) and PHP 7.2 took the gold 
If your site is still running on an outdated PHP version make sure you upgrade asap as the difference can be quite significant, see the chart below:
If you are would like to learn all the details and how we performed this benchmark test you can read the full post here:
The Definitive PHP 5.6, 7.0, 7.1, 7.2 & HHVM Benchmarks (2018)
If you have any questions just let me know.
Tom