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A couple of other metrics are measured by the same Google tools, and are commonly optimized in addition to CWV:
Total Blocking Time (TBT): Measures the total time a page is unresponsive to user input, i.e. between First Contentful Paint (FCP) and Time to Interactive (TTI). If this is a concern, reach out to your Browsi AM - we can help.
Time to First Byte (TTFB): Measures the time between the request for a resource and when the first byte of a response begins to arrive (the responsiveness of a web server).
First Contentful Paint (FCP): Measures the time from when the user first navigated to the page to when any part of the page's content (text, images (including background images),
<svg>elements, or non-white<canvas>elements) is rendered on the screen.