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If you are using GA code that is at all recent, it should have no impact on the page speed as it loads async. All the parts of the page that Google cares about will already have rendered by this point.

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PSI still says you should be using cacheable assets, and the gtag script has no cache-control header. Will users notice? No, but it might play into your score, which does play into your rankings.

I've still gotten a perfect score on PSI with GA enabled, but it is one piece of the puzzle.

The score from the page speed tool does not play into your rankings, only the real-world speed statistics from core web vitals. In the real-world it isn't going to make any difference.

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