Understanding FID Delays
Delays in user interaction can often be traced back to a busy browser main thread, particularly when heavy or unoptimized JavaScript is involved. Targeting a first input delay (FID) of 100 milliseconds is crucial, as anything beyond that can disrupt the user's experience. Interestingly, this benchmark is rooted in human behavior, dating back to a 1965 report that highlights our perception of instantaneous reactions.In this clip
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