Thank you for your interest. Please note that you are using a Burstable Performance Instance that receives CPU Credits to work. In case you want to improve the performance of the server, I suggest you use a different type of instance to run your Parse Server. You can check the official documentation of AWS to learn more about this:
Regarding the Parse configuration, please note that this Community forum is intended to solve problems related to the Bitnami Stacks, Virtual Machine or Cloud Images. For information regarding the application itself or customization of the content within the application, we highly recommend checking forums and user guides made available by the project behind the application.
I hope this information helps.