What they fail to mention is that you lose the ability to remove unused code, for example when you would otherwise import only some Bootstrap components' JS.
So in the end, their hosted copy might be much larger than if you had hosted an optimized copy yourself.
Using their service, it is also impossible for you to merge small dependencies and your application logic into one file to reduce the number of HTTP requests. The resulting higher number of gets might well make it slower than not using their CDN in the first place.
So in the end, their hosted copy might be much larger than if you had hosted an optimized copy yourself.
Using their service, it is also impossible for you to merge small dependencies and your application logic into one file to reduce the number of HTTP requests. The resulting higher number of gets might well make it slower than not using their CDN in the first place.