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gtmetrix.com suggest I defer parsing of 35 js files to increase page load time. I have 2 questions. I am very new to this and a little lost, so apologise in advance if I shouldn't be here asking such simple things.
Is there an easy way to know which js should be delayed for the quickest page load time. Which will not affect functionality? I have only identified 5 js files currently which I would be fairly confident would not affect the main page loading.