You might want to seek out actual numbers before you say that. More often than not, that particular cache entry is evicted because of the billion combinations of frameworks, versions and CDNs. You are very far from downloading 0 bytes even for the popular frameworks.
There's also the issue of availability. If you decide to use one, make sure to have local fallback. The one time I did some remote instrumentation on this, some users actually had trouble reaching the CDN. I have no idea why, it might have been DNS failures or routing problems or whatever, but that made the whole site freeze for those affected since there was no fallback.
There's also the issue of availability. If you decide to use one, make sure to have local fallback. The one time I did some remote instrumentation on this, some users actually had trouble reaching the CDN. I have no idea why, it might have been DNS failures or routing problems or whatever, but that made the whole site freeze for those affected since there was no fallback.