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Lazar Nikolov

Developer Relations Advocate

Lazar Nikolov is Web Performance Developer Advocate at Sentry. He is also an instructor on Egghead.io, has a very active YouTube presence and runs https://creatures.sh.

Blogs Published by Lazar Nikolov

How to reduce TTFB

Performance Monitoring

TTFB (Time to First Byte) is a commonly used metric that measures the duration between a client's HTTP request and the receipt of the first byte of the server's...

What’s the difference between API Latency and API Response Time?

Performance Monitoring

Imagine waiting more than a few seconds for a page to load. Or even worse, imagine waiting more than a few seconds every time you perform any action in an app o...

Atomic Repositories in Clean Architecture and TypeScript

Error Monitoring

You’re checking out on an e-commerce site. You have a cart with several items and quantities, and you click the checkout button. Under the hood, the operation f...

Why Clean Architecture makes debugging easier

Performance Monitoring

Let’s start with things we already know - complex projects are inherently hard to debug. The more complicated they are, the harder it is to debug them. The size...

How to identify fetch waterfalls in React

Performance Monitoring

Fetch Waterfalls are scenarios where multiple fetch requests are invoked in a sequential manner, not in parallel. This leads to some serious performance degrada...

The Forensics Of React Server Components (RSCs)

Performance Monitoring

In this article, we’re going to look deeply at React Server Components (RSCs). They are the latest innovation in React’s ecosystem, leveraging both server-side ...

Low effort image optimization tips

Performance Monitoring

“A picture is worth a thousand words”. So if a picture takes more than 4 seconds to load, does it mean that your website’s content fails to communicate a thousa...

Fetch Waterfall in React

Performance Monitoring

Have you seen this problem? Or maybe this one? You’ve most likely seen this: export const Component = () => { const [data, setData] = useState() const [load...

Fixing memoization-breaking re-renders in React

Performance Monitoring

React’s component-based approach to building web applications allows us to break up our web apps into smaller components that we can easily reuse. When a compon...

How to identify and fix Render-Blocking Resources

Performance Monitoring

Render-blocking resources are JavaScript and CSS files that prevent the web page from loading until they are downloaded. These might be critical resources that ...

Harnessing Distributed Tracing for Application Performance Optimization

Performance Monitoring

Distributed tracing is a powerful technique that allows you to track the flow and timing of requests as they navigate through a system. By linking operations an...

Code Refactoring and why you should refactor your code

Performance Monitoring

Software does not expire, but it “rots”. Its quality degrades over time. As you build your project and add features, you probably won’t always build it in a cle...

Web Fonts and the Dreaded Cumulative Layout Shift

Performance Monitoring

How frustrating is it when you’ve just landed on a web page, you click on a certain element and an ad or something else pops up and you end up clicking that thi...

Getting Started with Jetpack Compose

Recently, we wrote about the demonstrative move to declarative UI. With Jetpack Compose, Android is joining the declarative trends. Jetpack Compose, a new decla...

Mobile: The Future of Declarative UI Frameworks

The mobile development ecosystem has always been very diverse, arguably more diverse than the web development ecosystem. While it seems like every day there are...

Measuring application performance in Swift using transactions

Performance Monitoring

So you're building a mobile app that’s performing big data requests; or crunching big data. But now you're asking yourself: How will my app perform in productio...