What is website performance optimization?

Website performance optimization is the process of improving loading speed, responsiveness, layout stability, server response time, asset loading and overall user experience.

Can you fix Core Web Vitals issues?

Yes. I can diagnose and fix Core Web Vitals issues related to LCP, INP and CLS using code-level, asset, caching, server and layout improvements.

Do you fix production bugs?

Yes. I can investigate and fix frontend bugs, backend errors, broken forms, API issues, database problems, crashes and user flow issues.

Can you improve Lighthouse or PageSpeed scores?

Yes. I can improve Lighthouse and PageSpeed results by fixing real performance issues such as large bundles, render-blocking resources, unoptimized images, slow APIs and poor caching.

Do you work with React and Next.js performance issues?

Yes. I can optimize React and Next.js apps by reducing unnecessary renders, improving bundle size, using lazy loading, optimizing data fetching and fixing hydration or rendering issues.

Will you provide a performance report?

Yes. I can provide a clear report showing the main issues found, fixes applied, performance changes and remaining recommendations.

Support - Website Performance Optimization & Bug Fixing

I fix slow websites, broken features, production errors and Core Web Vitals issues so your site feels faster, works reliably and gives users a smoother experience.

Request a Website Audit View Portfolio

I diagnose and fix website bugs, slow loading pages, production errors and performance bottlenecks that hurt user experience and conversions. Using tools like Chrome DevTools, Lighthouse, Sentry and server logs, I identify the real cause of issues across frontend code, backend APIs, database queries, assets, caching and third-party scripts. The goal is not just to improve scores, but to make your website faster, more stable, easier to maintain and better for real users.

By Shahmeer RizwanLast updated: June 24, 2026

Tech stack:

React
React Native
Next.js
TypeScript
JavaScript
Nest.js
Node.js
Express.js
Chrome DevTools
Lighthouse
PageSpeed Insights
Sentry
Web Vitals
PostgreSQL
MongoDB
Redis

What you need to know

Key details about website performance optimization & bug fixing — what it involves, how it works and what to expect.

Website Performance Optimization

Slow websites lose users before they can take action. I analyze frontend code, assets, APIs, caching, database queries and server response times to find the real causes of poor performance and fix them properly.

Core Web Vitals and PageSpeed Fixes

Core Web Vitals issues often come from slow loading content, delayed interactions or layout shifts. I focus on LCP, INP and CLS improvements through image optimization, JavaScript cleanup, critical resource loading, caching and layout stability fixes.

Production Bug Fixing

Bugs in production can break forms, checkout flows, dashboards, APIs or key user actions. I trace errors through logs, monitoring tools and code review to fix the root cause instead of applying temporary patches.

Stability, Monitoring and Maintenance

After fixes are applied, I test the website across important user flows and provide a clear report. I can also help set up monitoring, error tracking and maintenance routines to catch future issues earlier.

What's included

Every website performance optimization & bug fixing engagement includes these core capabilities — tailored to your specific requirements.

Website bug diagnosis and root-cause fixing

Core Web Vitals audit for LCP, INP and CLS issues

Lighthouse and PageSpeed performance review

JavaScript bundle analysis, code splitting and lazy loading

Image optimization, compression and next-gen format setup

Caching, CDN and server response time improvements

Database query optimization and slow API debugging

Third-party script review and render-blocking resource fixes

Memory leak detection and frontend stability improvements

Production error tracking with Sentry or log analysis

Security patching for common dependency and code issues

Performance report with before-and-after recommendations

How it works

A structured, transparent process from initial requirements to production deployment.

Audit

I review your website, Lighthouse results, Core Web Vitals, error logs, analytics, server behavior and codebase to understand what is slowing or breaking the site.

Diagnosis

I identify the main causes behind bugs and performance issues, such as heavy JavaScript, unoptimized images, slow APIs, database queries, caching problems or third-party scripts.

Prioritization

I rank issues by user impact, severity and business risk so the most important fixes are handled first.

Fixes

I apply targeted fixes for frontend bugs, backend errors, slow queries, asset loading, caching, layout shifts, JavaScript execution and stability problems.

Testing

I test the fixes across devices, browsers and key user flows to make sure the website works correctly and does not introduce new issues.

Report

I provide a clear summary of what was fixed, what improved, what still needs attention and how to keep performance stable after launch.

Why invest in website performance optimization & bug fixing

Tangible outcomes your business gets when we work together.

Improve real website speed and user experience

Reduce production errors and broken user flows

Fix Core Web Vitals issues that affect usability and SEO

Lower bounce risk caused by slow pages and layout shifts

Make frontend, backend and database performance more stable

Create a cleaner codebase that is easier to maintain

Services included

Everything covered under website performance optimization & bug fixing.

Website bug fixing
Website speed optimization
Core Web Vitals optimization
Lighthouse audit
PageSpeed optimization
React performance optimization
Next.js performance optimization
JavaScript optimization
Image optimization
Caching and CDN setup
Database query optimization
API performance debugging
Production error fixing
Security patching
Website maintenance

Issues I fix

Common performance problems and bugs I diagnose and resolve.

Slow page loadingPoor Lighthouse scoresFailed Core Web VitalsHigh LCPPoor INPLayout shiftsRender-blocking resourcesLarge JavaScript bundlesSlow database queriesBroken formsAPI errorsProduction crashesMemory leaksThird-party script delays

Frequently asked questions

Common questions about website performance optimization & bug fixing — answered upfront so you can make informed decisions.

What is website performance optimization?: Website performance optimization is the process of improving loading speed, responsiveness, layout stability, server response time, asset loading and overall user experience.
Can you fix Core Web Vitals issues?: Yes. I can diagnose and fix Core Web Vitals issues related to LCP, INP and CLS using code-level, asset, caching, server and layout improvements.
Do you fix production bugs?: Yes. I can investigate and fix frontend bugs, backend errors, broken forms, API issues, database problems, crashes and user flow issues.
Can you improve Lighthouse or PageSpeed scores?: Yes. I can improve Lighthouse and PageSpeed results by fixing real performance issues such as large bundles, render-blocking resources, unoptimized images, slow APIs and poor caching.
Do you work with React and Next.js performance issues?: Yes. I can optimize React and Next.js apps by reducing unnecessary renders, improving bundle size, using lazy loading, optimizing data fetching and fixing hydration or rendering issues.
Will you provide a performance report?: Yes. I can provide a clear report showing the main issues found, fixes applied, performance changes and remaining recommendations.