That’s more than good! Having said that, you asked how to know if it affects site performance, the best way is to start testing out using some third-party tools. The one I use is Pingdom.
Additionally, in order to get the best out of your droplet’s possibilities, you’ll need to optimize it. What I always recommend is to install the latest PHP version available that works with your application. Add some server-side caching like OPcache and add to the equation PHP-FPM. These 3 steps will massively improve the server-side of things for your website.
Next, take a look at the website, see if you have a caching plugin, if you have optimized your images, if you have compressed your JS,CSS files so that they load faster. All of the previous can be done using plugins.
Additionally, all of the above should be visible once you do a Pingdom scan of your website. After all this has been done, then you can start monitoring your website and server to see if the traffic is too much to handle and if it’s slowing down your website.