Review of GTmetrix results

Hello guys,

I’ve set up my KEY APIs to analyze the loading of my site, and the results were as follows:

See full report: https://gtmetrix.com/reports/idiomas.proddigital.com.br/atZyGVa4
Simulate Baseline: https://idiomas.proddigital.com.br/

See full report: https://gtmetrix.com/reports/idiomas.proddigital.com.br/yiT81WEf
Simulate Async: https://idiomas.proddigital.com.br/?aj_simulate=async

See full report: https://gtmetrix.com/reports/idiomas.proddigital.com.br/mr8FqfeF
Simulate Defer: https://idiomas.proddigital.com.br/?aj_simulate=defer

See full report: https://gtmetrix.com/reports/idiomas.proddigital.com.br/sgqDg0Ea
Simulate Async (jQuery Excluded): https://idiomas.proddigital.com.br/?aj_simulate=async&aj_simulate_jquery=exclude

See full report: https://gtmetrix.com/reports/idiomas.proddigital.com.br/57mkI4Lo
Simulate Defer (jQuery Excluded): https://idiomas.proddigital.com.br/?aj_simulate=defer&aj_simulate_jquery=exclude

As you can see, the initial analysis of my site without Async and Defer had the best load of all. But should not this be the opposite, ie using Sync or Defer, the loading time should not be less?

I got confused!

Agrade?o.
Rodrigo Carlos