[{"data":1,"prerenderedAt":61},["ShallowReactive",2],{"\u002Fglossary\u002Ftime-to-first-byte-ttfb":3,"\u002Fglossary\u002Ftime-to-first-byte-ttfb:related":44},{"id":4,"title":5,"author":6,"authorImage":7,"body":8,"category":28,"date":29,"description":30,"draft":31,"extension":32,"letter":33,"meta":34,"navigation":35,"path":36,"readTime":37,"related":38,"seo":39,"stem":41,"term":42,"__hash__":43},"glossary\u002Fglossary\u002Ftime-to-first-byte-ttfb.md","Time To First Byte (TTFB)","Fabian Krumbholz","\u002Fimages\u002Fauthors\u002Ffabian-krumbholz.webp",{"type":9,"value":10,"toc":24},"minimark",[11],[12,13,14,15,19,20,23],"p",{},"A foundational web performance metric measuring the time from when a user makes a request to when their browser receives the very first byte of the HTML response. It is a fundamental measure of server and network responsiveness and is influenced by redirect time, DNS lookup, connection setup (including the TLS handshake), and the server's backend processing time. A slow TTFB creates a bottleneck for every subsequent metric, delaying both ",[16,17,18],"strong",{},"FCP"," and ",[16,21,22],{},"LCP",".",{"title":25,"searchDepth":26,"depth":26,"links":27},"",2,[],null,"April 8, 2026","A foundational web performance metric measuring the time from when a user makes a request to when their browser receives the very first byte of the HTML response.",false,"md","T",{},true,"\u002Fglossary\u002Ftime-to-first-byte-ttfb","1 min read",[],{"title":40,"description":30},"Time To First Byte (TTFB): Definition | Web Performance Glossary","glossary\u002Ftime-to-first-byte-ttfb","Time To First Byte","8MskXJIvF-79iGDX-kUJw8ndsSftN1Z5herj6p5RlEk",[45,49,53,57],{"path":46,"title":47,"description":48,"letter":33},"\u002Fglossary\u002Ftag-manager","Tag Manager","A tag manager (like Google Tag Manager) is a system that allows marketing and business teams to add and manage third-party marketing tags (snippets of code for analytics, advertising, etc.) on a we…",{"path":50,"title":51,"description":52,"letter":33},"\u002Fglossary\u002Fthird-party-scripttool","Third-Party Script\u002FTool","A third-party script or tool is any piece of code, functionality, or service that is provided by an external vendor and integrated into a website.",{"path":54,"title":55,"description":56,"letter":33},"\u002Fglossary\u002Fthrottling-cpu-network","Throttling (CPU & Network)","Throttling is a technique used in Lab Data tools (like Lighthouse) to simulate how a website would perform on slower devices or less reliable network connections.",{"path":58,"title":59,"description":60,"letter":33},"\u002Fglossary\u002Ftime-to-interactive-tti","Time to Interactive (TTI)","Time to Interactive is a performance metric that measures the time it takes for a page to become fully and reliably responsive to user input.",1787756716421]