Is it necessary to webpack resources though with CDN available?

I am new to webpack , and recently i find it is even slower to webpack my Jquery and bootstrap resource into bundle.js compared to Jquery and Bootstrap CDN loading method

Though webpack makes my Jquery or Bootstrap resource smaller and increase my web loading time , but it it faster to use Jquery or Bootstrap CDN in my situation.

I think maybe my Linux server doesn't have nice performance.

To loading resource from my own ordinary server , use CDN to loading from public nicer server would be better if you don't have a good web server ,right ?