Page Speed Insights and Measure Versus GT Metrix different results

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My agency is showing our performance as great in GT Metrix. In page speed insightsGTmetrix web vitals and measure, pagespeedinsightsresultsI am seeing a different picture. What does this mean?

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GrahamTheDev On BEST ANSWER

GT Metrix looks at your page on desktop without any throttling applied.

Page Speed Insights applies throttling to the network (to simulate 4G) and to the CPU (to simulate a mid-tier mobile phone with less processing power) and in a mobile viewport.

Also on Page Speed Insights the "Origin Summary" is real world data from people's devices, so that is the more reliable and important information.

See these answers I have given for more info: