Comments (2)
I notice that slowly the meaningful web metrics to collect have moved away from TTI to LCP these days. Can you shed some light on why that is the case after promoting TTI for the last couple of years by the webdev community?
Sure, the answer is relatively simple. While TTI was a revolutionary metric when it was first introduced (i.e. the idea that a page wasn't really "loaded" until its main thread was free) we've since come up with better metrics (e.g. FID and TBT) that more accurately measure the negative user experiences associated with poor interactivity.
The problem with TTI is that two sites with the same TTI might have vastly different load experiences (e.g. a page with a single, 10-second long task and a page with two, 51 ms tasks could have the same TTI).
I also noticed a TTI measuring lib and have been using it for a few weeks now. Would you suggest me to stop using it and if not then any plans of integrating that into web-vitals?
I would, we now only recommend measuring TTI in the lab. In the field we recommend FID.
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Awesome, thank you for letting me know!
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Related Issues (20)
- can't find ReportCallback or ReportHandler type HOT 3
- Are there any updates for soft-navs? HOT 2
- LoAF missed for some INP events HOT 9
- Facing issue while exporting `web-vitals/attribution` using `browserify` HOT 2
- LoAF Performance entry script sourceFunctionName and sourceURL logged values HOT 4
- Using `performance.eventCounts` instead of `performance.interactionCount` HOT 2
- Heads Up on Changes to INP Measurement When Interfered with JS Modal Dialogs HOT 3
- TypeError: Cannot read properties of undefined (reading 'processingEnd') HOT 13
- TypeScript 5.5 compatibility
- Speculation rules can impact on increase values for INP ?
- Missing Cumulative Layout Shift (CLS) metric when batching multiple reports together in a single network request HOT 5
- Add clarification regarding event listener in event batching section
- LCP and CLS fired on interaction HOT 5
- Tgt
- Update LCP attribution to handle the first frames of animated content HOT 3
- INP attribution helper latestProcessingEnd never initialized HOT 1
- Missing LoAF attributions for INP due to violating internal invariants
- Any way to simulate clicks for INP testing? HOT 3
- Identical abstract selectors can be returned as distinct strings HOT 6
- onINP trigger always when browser tab change ? HOT 1
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