| Availability | Within a time range, the ratio of the number of times the target service can be accessed normally to the total number of accesses. |
| First Contentful Paint (FCP) | Internet Explorer: The time it takes to display the first home page. Chrome browser: Set the first screen size. When the page Element (not the URL of Waterfall Chart) is loaded beyond the first screen size, record First Contentful Paint (FCP) (full content rendering time from Chrome FCP) |
| Total Download Time | Monitor the total time consumed by a page, that is, the time from the start of monitoring to the end of monitoring. |
| Network Layer Time | When monitoring a page, the total time consumed by Network communication occurs. |
| Client Time | The total number of time segments during which Network communication does not occur when monitoring a page. |
| Base Page Download Time | The basic page is the time consumed by the WEB server. |
| Time to receive additional data | The monitoring task waits for additional data to occur. That is, the time elapsed from the completion of the page download to the last time additional data is received. |
| Page Load Time | The time it takes for the browser to make a series of preparations for the page to be accessed. That is, the time from the start of monitoring to the time when the browser status bar displays "Opening Page". |
| Redirection Time | Redirection Time is the elapsed time before receiving the first Element from the WEB server redirection instruction to RequestWEB server. |
| DNS Time | The time it takes to resolve a specified domain name into an IP address through the domain name resolution service. |
| Connection Establishment Time | The time taken to establish a TCP/IP connection between the browser and the WEB server. |
| SSL Handshake Time | The time taken to establish a Secure Sockets Layer (SSL) connection between the browser and the WEB server. |
| Request Time | The elapsed time starts when the browser sends HTTPRequest and ends when the browser sends HTTPRequest. |
| Time to First Byte (TTFB) | The time it takes from the end of the browser sending HTTPRequest to receiving the first data packet returned by the WEB server. |
| Time to Last Byte | The time it takes for the browser to receive the non-first data packet returned by the WEB server. |
| Content Download Time | When monitoring a page, from the perspective of the page, the time it takes for the browser to receive non-first data packets returned by the WEB server. |
| Connection Termination Time | The time consumed by the browser to close the TCP/IP connection corresponding to Element, which corresponds to the connection established in the "Connection Establishment Time" indicator. |
| Number of Page Resources | The number of Element downloaded from the WEB server during browsing a page. |
| Redirect Count | During the process of browsing a page, a total of server Redirect Count occurred. |
| Total Page Size | The total number of Network communication bytes returned from the WEB server during browsing a page. |
| Total Resources Size | When downloading a certain Element in the page, such as image Element, CSSElement, the number of bytes returned from the WEB server. |
| Download Speed | Download Speed = Total Page Size / Content Download Time. |
| Base Page Download Speed | Base Page Download Speed = Base Page Size / Base Page Download Time. |
| Base Page Size | Base Page Size is the total number of bytes of the plain text HTML file. |
| Data Downloaded by FCP | The browser displays the total number of bytes of Element contained in the first main page. |
| Number of Resources by FCP | The browser displays the total number of Element contained in the first main page. |
| DNS Lookup Count | During the process of browsing a page, including Element in the page, the total number of DNS resolutions occurred. |
| Total DNS Lookup Time | When browsing a page, including Element in the page, the total time spent on DNS resolution occurs. |
| TCP Connection Count | During the process of browsing a page, including Element in the page, the total number of connections established. |
| Total TCP Connection Time | During the process of browsing a page, including Element in the page, the total time it takes to establish a connection. |
| DOM Element Count | The number of DOMElement downloaded from the WEB server during browsing a page. |
| Failed Resource Count | During page browsing, the total number of elements where errors occur. |
| Connection Attempts (QUIC) | The number of times Element using the QUIC protocol was used to establish a connection while browsing a page. |
| Successful Connections (QUIC) | The sum of the number of Element connections using the QUIC protocol during browsing a page. |
| Time to First 100KB (QUIC) | The time it takes to receive the first 100K QUIC data while browsing a page. |
| Largest Contentful Paint (LCP) | The rendering time of the largest image or block of text visible in the viewport, relative to the time the user first navigated to the page. |
| Slow Speed Ratio | Within the specified time range, the indicator threshold is lower than the set threshold (the threshold can be adjusted based on business needs). |
| SpeedIndex | SpeedIndex indicator value is used to measure page display (loading) speed. |
| DOM Processing Start Time | domLoading for W3C metrics. |
| Time to Interactive (TTI) | domInteractive for W3C metrics. |
| Time to Start Loading Content | domContentLoadedEventStart for W3C metrics. |
| Time to Finish Loading Content | domContentLoadedEventEnd for W3C metrics. |
| DOM Content Loaded Time | The domComplete metric in W3C timing. |
| Onload Time | loadEventStart for W3C metrics. |
| Certificate Expiration Time | The expiration time of the certificate used to access Element. |
