It is now well understood that the quicker a website loads the more likely it is that a user will convert.
The site WPO stats has numerous studies demonstrating the importance of web performance.
This article on Cloudfare's site has some concrete numbers, claiming that "Walmart found that for every 1 second improvement in page load time, conversions increased by 2%"
There are a myriad of reasons why your ruby on rails site might be slower than it could be:
If you are concered that your Ruby on Rails powered website is not as fast as it could be, get in touch for a free initial consultation.