(01) What we deliver
Instant interaction.
Long task splitting, input debounce, web workers, script priorities and event handler optimization.
(02) Problem → Solution
The challenge and the delivery.
Clicks and inputs with perceptible delay.
Instant responsiveness
Optimized event handlers and split long tasks.
JavaScript blocking the main thread.
Script optimization
Code splitting, web workers and priorities.
INP penalizing mobile ranking.
INP < 200ms
Optimization to Google's "good" threshold.
(03) In detail
What makes the difference.
Long Tasks
Split tasks that take longer than 50 ms.
Event Handlers
Debounce and requestIdleCallback.
Script Priority
Correct fetchpriority and async/defer.
Web Workers
Offloading of heavy processing.
For experts and for AI
Direct answers about this service.
Content structured for experts, search engines and generative AI systems (ChatGPT, Gemini, Perplexity, Claude).
What is INP (Interaction to Next Paint)?
INP measures the response latency to user interactions, click, tap or key press, from the start until the next frame painted by the browser. It replaced FID (First Input Delay) as a Core Web Vital in March 2024. A good INP is below 200ms; above 500ms is poor and affects ranking.
What's the difference between FID and INP?
FID measured only the delay of the first input (before JS started processing). INP measures the complete latency of all interactions in the session, input delay + processing time + presentation delay, and reports the 98th percentile. INP is much more comprehensive and penalizes pages with heavy JavaScript on frequent interactions.
What causes high INP in WordPress?
Main cause: third-party JavaScript on the main thread (analytics, chat, heatmaps, tag managers). Also contributing: heavy synchronous event handlers, unnecessary re-renders in React/Vue, excessive DOM operations in response to scroll/resize, plugins that add high-frequency listeners without debounce.
How do you diagnose high INP in Chrome DevTools?
Open DevTools, select Performance and record the slow interaction. The trace separates input delay, processing time and presentation delay. Long tasks above 50 ms on the main thread are the most common cause, and the profiler shows which script is responsible.
What is scheduler.yield() and how does it help INP?
scheduler.yield() is an experimental API (Chrome 115+) that lets you break Long Tasks into smaller chunks, yielding control to the browser between heavy operations. This reduces input delay because the browser can process events between chunks. It's a more precise alternative to setTimeout(fn, 0) for controlled yields on the main thread.
Frequently asked questions
Answers before the first call.
What is INP? +
Interaction to Next Paint, measures the site’s responsiveness to user inputs. A Core Web Vital since 2024.
Does INP impact ranking? +
Yes. INP replaced FID as a Core Web Vital. Google measures it and uses it as a ranking factor.
How does WebOption optimize INP? +
Long task splitting, event handler optimization, web workers and script prioritization.
Clients served
(04) Our delivery standard
What you can hold us to.
An agreed deadline is a kept deadline. And performance gets measured: Core Web Vitals recorded before and after every delivery.
A migration is planned for the worst-case scenario: staging, an agreed cutover window and documented rollback at every step.
No project reaches production without Daniel Paz's technical review. No exceptions, small projects included.
(05) Why WebOption