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How to control cache of some js files ?

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Last Modified: 2017-03-20
Hello, when I test the performances of my website I am having some errors like this :
cache.PNGWhat should I do ?
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Top Expert 2015

Commented:
You cannot control external resources. Facebook and Google are always fast to load.
Is the picture from gtmetrix.com ?

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Commented:
Yes.
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Commented:
Ah, thank you.
Is GtMetrix the best way to know the performance of a website or do you have another website which can help me more ?
Top Expert 2015

Commented:
It points configuration issues just fine in easy to assess form. It is free compared to holding a machine across one ocean to meter user experience for one single site.

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