SEO Fundamentals - Technical SEO Basics
A website's First Input Delay (FID) is reported as 350 milliseconds, but the developer expects it to be under 100 ms. What is a likely cause of this high FID?
A website's First Input Delay (FID) is reported as 350 milliseconds, but the developer expects it to be under 100 ms. What is a likely cause of this high FID?
medium📝 Analysis Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand what affects FID
FID is delayed by heavy JavaScript blocking the browser's main thread.Step 2: Eliminate other options
Layout shifts affect CLS, slow images affect LCP, content size affects load but not FID directly.Final Answer:
Heavy JavaScript blocking the main thread -> Option DQuick Check:
High FID = JS blocking main thread [OK]
Quick Trick: Heavy JS causes slow response (high FID) [OK]
Common Mistakes:
- Blaming layout shifts for FID
- Confusing image load with FID
- Ignoring JS impact on interactivity
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