Bolt
performance
Font Loading Causing Layout Shift - FOUT or FOIT
Fonts load slowly causing text to flash or shift layout (Cumulative Layout Shift). Users see unstyled text briefly before custom font loads.
This impacts Core Web Vitals and user experience.
Error Messages You Might See
Cumulative Layout Shift > 0.25
Font blocking render for 3+ seconds
Text remains invisible while custom font loads
FOUT/FOIT causing layout thrashing
Common Causes
- Loading fonts from CDN without preload
- Large font files not optimized or subsetted
- Font-display not set to optimal value
- Loading too many font variations
- Self-hosted fonts not configured for preload
How to Fix It
Add preload to head:
Use font-display: swap in @font-face to prevent invisible text
Subset fonts: include only characters you use
Use Next.js font optimization: import { Poppins } from 'next/font/google'
Limit to 2-3 font families max
Real developers can help you.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
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Meïr Ankri
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Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
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Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
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I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
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Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What's the best font-display value?
swap: shows system font immediately, updates when custom loads (best UX). fallback: wait 100ms then show system
Should I self-host or use CDN?
Self-host for control and speed. CDN (Google Fonts) if you want simplicity
How do I minimize font downloads?
Subset fonts to used characters, use variable fonts for multiple weights, limit to necessary fonts