How can I hire Nazmul Hawlader for Shopify theme or app development?

You can reach out directly via the hire form on nazmulcodes.org or hire through verified freelance platforms including Upwork (Top-Rated profile), Guru, Freelancer.com, or direct contract.

Do you build custom Shopify themes without page builders?

Yes. All bespoke themes are hand-coded with native Shopify Liquid, modern Vanilla JS, and CSS custom properties without bulky page builders (PageFly, GemPages, Shogun), guaranteeing sub-second load times and 90+ Lighthouse scores.

Can you fix broken Shopify themes, Liquid errors, and checkout glitches?

Yes. We offer rapid same-day troubleshooting for Liquid syntax errors, JavaScript console conflicts, broken AJAX cart drawers, mobile layout glitches, and Checkout Extensibility configurations.

How do you protect SEO rankings and fix broken URLs during Shopify migrations?

We execute comprehensive website crawls to detect 404 errors, map 1-to-1 and wildcard 301 URL redirects, verify canonical tags, and audit Google Search Console to protect 100% of organic search rankings.

Can you configure Shopify Flow automations and payment gateways?

Yes. We design end-to-end Shopify Flow automation workflows for restocks, cancellations, and order triage, as well as configure Shopify Payments, Stripe, PayPal, local payment gateways, and Shopify Markets multi-currency routing.

Performance & Web Vitals9 min readAugust 28, 2026

Mastering INP: How to Debug & Optimize Interaction to Next Paint in React & Remix

A practical guide to identifying long main-thread tasks, optimizing React re-renders, and passing Google’s newest Core Web Vital metric.

Nazmul Hawlader

Senior Shopify & Full-Stack Engineer

Note: Key takeaways in this guide: • Understand how INP replaced First Input Delay (FID) as a holistic measure of page responsiveness. • Use the PerformanceObserver API to log interaction durations exceeding 200ms. • Break up long CPU tasks with scheduler.yield() or requestAnimationFrame.

In March 2024, Google officially replaced FID with Interaction to Next Paint (INP). While FID only measured the first click on a page, INP tracks every tap, click, and keystroke throughout the user session. Failing INP drops your site out of Google’s mobile performance tier.

1. Yielding to the Main Thread

When processing complex calculations, filtering large product lists, or computing price estimations, yield execution back to the browser so paint frames are not blocked.

Summary & Key Conclusion

Prioritizing interaction latency ensures your interactive web applications feel instantaneous to every touch.

Written by Nazmul Hawlader

Top Rated

Senior Full-Stack Engineer & Official Shopify App Store developer. Founder of Stockly and Kilo (kilo.nazmulcodes.org), specializing in high-performance Shopify apps, client-side media compression, and sub-second web performance.

Read My Full Story Consult on Upwork

Mastering INP: How to Debug & Optimize Interaction to Next Paint in React & Remix

1. Yielding to the Main Thread

Summary & Key Conclusion

Written by Nazmul Hawlader

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