You're facing a surge in web traffic. How do you ensure your application performs at its best?

Optimizing code is essential for handling traffic surges. Focus on identifying and eliminating performance bottlenecks through careful analysis. Improve code efficiency by selecting suitable algorithms and data structures, reducing unnecessary operations, and managing memory effectively. Remember to balance performance with code readability for long-term maintainability.

Ensuring the web application to run at best during surge in traffic can be achieved with multiple phases during web app development like Designing, Coding, Reviewing, Deploying phases: 1. In a 3 tier Architecture, Databases tend to bottle neck for performance, which is where effective caching would help provided with strong cache bursting strategy too. 2. Follow the pattern of Write once and Read Many in 3 tier architecture at all tiers or layers. 3. Coming to coding, Always follow a pattern of writing the code as reusable utils, start with concrete implementation iterate the code into smaller functions which can be reused and independent and replacable with efficient code in future.

There are several ways to optimize your code and application performance. From the code end, static content generation, architecture, etc. When we work on the Client side, we must know that we are dealing with the user's computer and machine resources. So when we deal with features that require user resources, keep this point in mind. Use cache, local, session storage, web workers. When using more backend or architectural resources, using CDN, evaluating the possibility of BFF, Cache and optimization of search resources in the database, etc.

Efficient Scaling Strategy for Addressing Performance Issues: 1. Design for horizontal scaling rather than vertical scaling. It's easy to choose vertical scaling, but in the long term, horizontal scaling works very well, even though it comes with the cost of more time during the development phase. 2. Choosing the right cloud-based provider often plays a crucial role. Choose a cloud-based provider who gives more control and more plug-and-play components in the architecture of the web app. 3. Lastly, auto-scaling has to be used with effective guardrails in place.

If you are not using CDN for a web app, then you are missing out many performance benefits. Its is must to leverage CDN. 1. use CDN effectively, ensure when deployment is done the CDN gets updated 2. Have a separate sub domain for serving static assets served via CDN is an effective strategy. 3. Investing in CDN based architecture will definitely come in handy once web traffic increases for web app.

Using a CDN can greatly help with the performance and use of your application. Distributing static content around the world by bringing the data closer to the user makes your application much faster and reduces latency if you only use a single instance or server. In addition to offering features such as caching, attack prevention, for example, DDoS. Example of tools: Akamai, CloudFlare...

Continuous monitoring is crucial for maintaining application performance. Telemetry tools like Grafana can help monitor all layers of the application stack and enable you quickly identify where the root cause of performance issues are. Examples of things to monitor include: server resources, connection requests and response times, success/failures in core functionality, database query times, queue sizes and throughput rates. Benchmark healthy values for all metrics and set up alerts when unusual thresholds are met so you can pre-empt issues before they impact users. Monitoring is an effective way to triage performance issues but can also serve as a useful communication tool between technical and non-technical team members.