Well, generally speaking Grav should run very fast. You need to ensure you are running an up to date version of PHP. 5.4 works, but 5.5 is better, and 5.6 is even better than that.
Also because Grav is file-based, a modern and fast filesystem is important too. I know that some hosting providers with grid-based-filesystems such as MediaTemple don't work well with Grav.
Just a note, that even on bog-standard cheapo hosting it should run pretty well, but a modern SSD-based RAID file system will ensure it flies! You can check our hosting section in the docs for recommendations.
One other thing. The actual site you developed could also impact performance. If you are doing lots of logic in Twig, or doing logic that is not cached, this can negatively effect performance.
If you would like me to test performance, you can zip up your entire site and send me a link to download it. I can then run it locally and let you know how it runs for me.
FYI, blog-s keleton usually runs in about 30ms (as reported by Grav debugger bar) for me, and the base one-page Grav runs in about 15ms.