What is API Performance and How Can It Be Improved?

Stfalcon Wins a Clutch Global Award

APIs act as channels for exchanging data and commands, making them crucial in making robust and responsive digital ecosystems. As dependency on APIs increases, it is vital to optimize their performance to prevent slow response times that could significantly impede the user experience.

For creating expeditious response times and exceptional user experiences, developers can carefully examine the underlying architecture, accordingly, use caching mechanisms, and diligently optimize request and response payloads. Through these efforts, the potential of APIs can be improved to create agile and efficient digital platforms.

What is an API?

The meaning of API (Application Programming Interface): it is a set of tools and functions in the form of an interface for creating new applications, thanks to which one program will interact with another. Developers can link their products to others and expand their functionality.

APIs are developed by most large companies for either clients or internal use. Different APIs are also used by regular users.

The API of a remote server is interacted with by a user when visiting any page on the Internet. The server part receives requests and sends responses. Moreover, with the help of the API, one can execute different tasks without having to exit the website. The company can develop its APIs and sell them as a product.

For example, the Weather Underground, which is owned by IBM, sells access to its weather data API. This information is used by weather applications and services. Now that you know what is the meaning of API, we can move to API Performance.



Client Manager

What is API Performance?

API performance is a crucial aspect of software engineering, it shows the effectiveness and responsiveness of an API when subjected to different functional demands. This criterion includes latency, throughput, and reliability, collectively defining the user experience and overall system efficiency.

For instance, low latency and high throughput are crucial for real-time applications such as financial trading platforms, while impeccable reliability is essential for mission-critical systems in the healthcare sector. To test API performance, developers must carefully evaluate and fine-tune the underlying architecture while considering potential bottlenecks and scalability concerns. Monitoring and benchmarking API performance testing suites improve API performance, ensuring a reliable software ecosystem.

The challenge of API performance

The challenge of API performance is creating a balance between delivering reliable services and adhering to the constraints of scalability, infrastructure, and budget. As APIs are integral to modern software systems, used by multiple users and use-cases with optimal performance become acute.

Addressing latency and throughput concerns need the implementation of effective algorithms and data structures, as well as the optimization of network protocols and infrastructure. Developers need to have a good understanding of the underlying systems and their limitations.

API reliability and availability show challenges, as APIs must be resilient to failures and flawlessly handle various error scenarios. You need to implement fault-tolerant and self-healing mechanisms with monitoring systems.

Security threats and regulatory compliance mandates make developers adopt robust security practices and adhere to standards, which adds more complexity.

Developers need to adopt cutting-edge technologies and methodologies, such as containerization and microservices, at maintaining perfect API performance in the ever-evolving technological landscape.

How can API performance be improved?

Improving API performance need a comprehensive approach that embraces different aspects of the SDLC, from design and implementation to monitoring and optimization. The following strategies can significantly improve API performance:

  • Efficient Design: RESTful architecture, facilitates the creation of scalable and performant APIs. This involves utilizing data formats, such as JSON, andProtocol Buffers, using caching mechanisms, and rate limiting to prevent overloading.
  • Optimization: Utilizing efficient algorithms and data structures to reduce computational complexity, and minimize payload size with the help of data compression, can come up with lower latency and higher throughput.
  • Load balancing: Distribution of incoming API requests among multiple servers to avoid bottlenecks and ensure consistent performance, even during times of high demand. This can be an effective way to improve overall API performance.
  • Caching: It plays a significant role in improving API performance. When you implement caching strategies, such as edge caching or application-level caching, it minimizes redundant data retrieval and processing, so it reduces response times.
  • Adopting asynchronous communication patterns: Message queues or event-driven architectures are an effective way to enhance scalability and responsiveness for time-consuming operations.
  • Connection pooling: By reutilizing existing connections to backend services, you can reduce resource consumption and enhance performance.
  • Monitoring and benchmarking: It can help identify potential issues and support data-driven optimization efforts.
  • Implementing security best practices: Proper authentication and authorization mechanisms preventing unauthorized access and reducing malicious activity on API performance.

Regularly updating the API's codebase and infrastructure ensuring high-performance standards and user satisfaction.

Tips to optimize your API's Performance

Optimization of API's performance is one of the most important factors in delivering an efficient and flawless user experience. Below you can find 5 key strategies to significantly improve your API performance:

Cache Requests

Implementing smart caching strategies provides the temporary storage of often accessed data, so reducing latency by reducing redundant processing and data retrieval. Different caching methods can be utilized, such as edge caching provided by Content Delivery Networks (CDNs), server-side caching, or browser caching. To optimize caching effectiveness, choose cache expiration policies and algorithms of cache eviction, which will help provide data freshness and ensure cache utilization.

Prevent Abuse

Implementing robust security measures, like rate limiting and API key authentication, can reduce the risk of abuse and excessive usage. Rate limiting restricts the number of requests per client within a timeframe, ensures resource allocation, and prevents system overloading. API key authentication provides an additional layer of security, allowing only authorized users to access the API, preserve system resources, and maintain optimal performance.


Adopting the PATCH approach for partial updates can greatly improve performance by transmitting the modified data rather than the entire resource representation. This can reduce payload size and minimize data processing overhead, it will result in faster request handling and enhanced API responsiveness.

It's important to limit payloads by returning only essential data to clients. You can use pagination for large datasets, and employ data compression techniques like Gzip. Streamlined data formats like JSON or Protocol Buffers can also improve data transmission by providing a more compact representation compared to other formats such as XML.

Faster Network

For optimal performance, you need to host your API on a reliable, high-performance infrastructure. Content Delivery Networks (CDNs) can help minimize latency and redundancy, so the user experience is improved. Adopting current network protocols like HTTP/2 or QUIC will enhance connection efficiency with features such as multiplexing, header compression, and improved congestion control. These features provide fast and reliable API communication, so a high-performance API ecosystem.

API performance testing metrics

API performance metrics are essential in software engineering and involve measures that help developers to provide performance testing of API. These metrics with throughput, latency, error rate, and availability provide insights into user experience, areas for improvement, and efficiency of the system.

  1. Latency shows the time between an API request and the corresponding response received. This metric is crucial for time-sensitive apps. Monitoring latency can help developers in processing bottlenecks or pinpointing networks and implementing appropriate optimization measures.
  2. Throughput (requests per second) shows the API's capacity to handle requests and its ability to scale under changing demand. By evaluating throughput, you can identify limitations in infrastructure and make decisions based on system architecture and resource allocation.
  3. Error rate shows the proportion of requests with errors to the total number of requests processed. Monitoring enables developers to see patterns in failed requests, identify potential issues in the API or client usage, and address them to improve overall reliability.
  4. Availability is a percentage or several "nines" (99.9% or "three nines"), which mark the API's uptime and resilience to failures. Availability is one of the most important factors for mission-critical apps, and monitoring this metric will help you implement fault-tolerant mechanisms.

Our Experience

TaskRunner - an online platform for ordering services

Stfalcon was approached by the client with a pre-existing solution, however, the users were frequently reporting issues and malfunctions with both the applications and the admin panel. Several external services are integrated with the backend to carry out various operations such as processing payments for orders and sending emails, SMS, and push notifications to exchange data with client mobile apps via REST API.

Read the full case study

Increasing the reliability and resilience of the product backend and the system as a whole is achieved by operating in the Kubernetes environment.

Bottom Line

The efficiency, speed, and reliability of an API performance is a critical aspect that directly affects the API's user experience. Response time, request rate, and error rate are all important factors to consider when evaluating API performance.

Ensuring good API performance guarantees a seamless user experience. Slow response times, reduced functionality, or even application crashes can be caused by poor performance, which can result in dissatisfied users and lost customers.

Stfalcon is a software development company that specializes in building web and mobile applications. With scalability in mind, we can design your API architecture to easily handle increased traffic and data loads as your user base grows.

To enhance the performance of your API, Stfalcon can examine and refine code, identifying and fixing bottlenecks in the code or reducing the number of database queries needed to generate a response. If you are interested in better API performance and satisfied users, contact us, free consultation is available.