Does Page Speed Actually Matter?

Here's what real data says about how Core Web Vitals correlate with search traffic.

Based on analysis of 105,912 pages · Last 30 days

TTFB

Moderate correlation
Measures server responsiveness. How long the server takes to respond.
Avg. value
0.61s
Good threshold
< 0.8s
Sample
14,620

SI

Moderate correlation
Measures how quickly page content is visually populated.
Avg. value
6.03s
Good threshold
< 3.4s
Sample
14,528

LCP

Weak correlation
Measures loading performance. How long until the largest element is visible.
Avg. value
9.66s
Good threshold
< 2.5s
Sample
20,634

CLS

Weak correlation
Measures visual stability. How much the page layout shifts during loading.
Avg. value
0.05
Good threshold
< 0.1
Sample
20,755

FCP

Weak correlation
Measures perceived load speed. When the first content becomes visible.
Avg. value
3.59s
Good threshold
< 1.8s
Sample
14,620

FID

Insufficient correlation
Measures input latency. Delay before the browser processes the first user interaction.
Avg. value
0.32ms
Good threshold
< 100ms
Sample
20,755

Google's Core Web Vitals Thresholds

Metric Good Needs Improvement Poor
LCP
Largest Contentful Paint (LCP)
 < 2.5s 2.5s - 4.0s > 4.0s
CLS
Cumulative Layout Shift (CLS)
 < 0.1 0.1 - 0.25 > 0.25
INP
Interaction to Next Paint (INP)
 < 200ms 200ms - 500ms > 500ms
FCP
First Contentful Paint (FCP)
 < 1.8s 1.8s - 3.0s > 3.0s
TTFB
Time to First Byte (TTFB)
 < 0.8s 0.8s - 1.8s > 1.8s
FID
First Input Delay (FID)
 < 100ms 100ms - 300ms > 300ms
SI
Speed Index
 < 3.4s 3.4s - 5.8s > 5.8s

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