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 website without having to directly edit the site's code. While this provides incredible agility, tag managers are one of the most common sources of severe performance problems if not properly governed. They make it easy to inject numerous, heavy Third-Party Scripts that can slow down the site, often without the development team's awareness.
Related web performance terms
- Third-Party Script/Tool
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.
- 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.
- Time To First Byte (TTFB)
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.
- 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.