Expand description
Measurement constant definitions.
Constants§
- APP_
START_ COLD - The time it takes for the app to start from a cold state.
- APP_
START_ WARM - The time it takes for the app to start from a warm state.
- CLS
- Tthe sum total of all individual layout shift scores for every unexpected layout shift that occurs during the entire lifespan of the page.
- FCP
- The time it takes for the browser to render the first piece of meaningful content on the screen.
- FID
- The time from when a user first interacts with a page to the time when the browser is actually able to begin processing event handlers in response to that interaction.
- FP
- The time it takes for the browser to render the first pixel on the screen.
- FRAMES_
FROZEN - The number of frames that took longer than 700ms to render.
- FRAMES_
FROZEN_ RATE - measurements.frames_frozen divided by the measurements.frames_total.
- FRAMES_
SLOW - The number of frames that took longer than 16ms (Android) or 16.67 (iOS) to render.
- FRAMES_
SLOW_ RATE - measurements.frames_slow divided by the measurements.frames_total.
- FRAMES_
TOTAL - Total frames rendered.
- INP
- The time it takes for the browser to render the next frame after a user interacts with the page.
- LCP
- The time it takes for the largest contentful paint element to be rendered on the screen.
- STALL_
COUNT - A stall is when the JavaScript event loop takes longer than expected to complete. Only applies to React Native.
- STALL_
LONGEST_ TIME - The longest stall time is the time of the longest event loop stall. Only applies to React Native.
- STALL_
PERCENTAGE - Stall percentage is equal to the stall_total_time divided by the transaction.duration. Only applies to React Native.
- STALL_
TOTAL_ TIME - The total stall time is the total combined time of all stalls. Only applies to React Native.
- TTFB
- The time it takes for the first byte of a response from the server to reach the user’s browser after a request is made.
- TTFB__
REQUESTTIME - The time it takes for the server to process the initial request and send the first byte of a response to the user’s browser.