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Glossary

Check out our glossary of common DevOps, monitoring and development terms and definitions.

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C

Cumulative Layout Shift (CLS)

Cumulative Layout Shift (CLS) is a core Web Vitals metric and it calculates the shifting of elements while the page is being downloaded and rendered.

Cache

In computer science, a cache is a storage location used to temporarily store data used by servers, apps, and browsers to speed load times.

D

DNS Lookup time

DNS stands for Domain Name System, a server or set of servers that store a record of domain names and their associated IP addresses.

F

First Input Delay

First Input Delay (FID) is the metric that calculates the time it takes for the browser to respond to the first client request. It’s measured in milliseconds.

H

HTTP Requests

An HTTP request is made from a client to a host located on the server in order to receive a resource needed to build the content.

L

Largest Contentful Paint (LCP)

Largest Contentful Paint (LCP) is a Core Web Vitals metric that measures how long it takes a website to render the largest part of the content on the screen. In most cases, LCP refers to the content above the fold rather than the entire page.

R

Render time

Render time is the metric that refers to the time it takes for a website or web app to load enough that the user can actually interact with the page.

Response Time

Response time refers to the amount of time it takes for a server to respond to a client's request and is measured in milliseconds.

S

SSL Certificate

An SSL certificate is a digital certificate that provides authentication for a website is and is used to ensure internet security by preventing any third party with malicious intent from intercepting, reading, or modifying any information transmitted.

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