The factors that determine the size of cloud server resources required by a mini program depend on multiple factors, including the size, traffic, functional requirements, and performance requirements of the mini program. Most importantly, continuously monitor the performance and resource usage of your mini program to ensure server resources are sufficient to meet demand, and make adjustments over time. This will ensure that your mini program remains stable and performant under the increasing number of users and traffic.

　　User scale: If your mini program has a small user scale, you may not need a large server. But if the user scale is large, more computing and storage resources are needed to process requests and store user data.

　　Traffic expectations: Expected traffic is one of the key factors in determining server requirements. If you expect hundreds or thousands of users to access your applet every day, a smaller server may be sufficient. But if you expect tens or hundreds of thousands of users per day, you may need a larger server or load balancing solution.

　　Functions and services: If your mini program provides complex functions and services, such as real-time chat, multimedia processing, large-scale data analysis, etc., you may need more computing resources to support these functions.

　　Database requirements: If your applet needs to handle a large number of database queries and write operations, you need to ensure that the database server can handle the load. This may require more CPU and memory resources.

　　Performance requirements: If you have high performance requirements for your mini program, such as fast response time and low latency, you may need a more powerful server or use acceleration technology such as CDN.

　　Data storage requirements: If your applet needs to store a large amount of user data, media files or logs, you need sufficient storage capacity.

　　Budget: Final server selection is also limited by budget. Larger servers and more resources generally increase costs.

　　Based on the above factors, you can choose the cloud server specifications suitable for your mini program. Usually, cloud service providers provide different types and specifications of cloud servers, and you can choose the appropriate specifications according to your needs. You can also expand as needed as your mini program grows to meet the increase in users and traffic.