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>> Even Google's own tag manager/analytics scripts lowers your page speed score when they are on the site.

I never understood why Google doesn't fix this. I want to use Google Analytics but their own tool penalizes me for it because it gets unproperly cached on Google's own servers? That's just stupid.

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It's just a tool with a random score - why does it matter? Most of the recommendations are now outdated. Focus on overall experience and there are plenty of RUM monitoring scripts you can use (that take advantage of the very fine grained performance timings available in browsers today).

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