Have you benchmarked that? Each host you add has its own overhead thanks to DNS, TLS, etc. and every time I’ve done the tests, that cancels out the benefits entirely for a site which itself uses a CDN. I’ve also tended to see numbers for public CDNs which suggest that things aren’t cached as often as you’d like - maybe if it’s a popular project which hasn’t updated in years but otherwise version spread undercuts hit rates dramatically.

My rule of thumb is that public CDNs aren’t a performance move in the HTTP/2 era (i.e. 2016 or later). They may still be convenient, however.