HTML with Bootstrap

I’m now doing the bootstrap tutorial here on the freecodecamp. Everything was going fine until I included bootstrap in my html file : . Now the website(on the localhost) takes too long to refresh. What should I do?

Can you send a link to your project so as to understand your problem more clearly and help you in a better way.

@Nikolas, as @kt20162 stated, we need more information to diagnose the issue.