From somewhere in the Northwest nearish to Manchester, UK, on a slow link, using apachebench (ab -n20 "http://...:

No CDN:

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:      140  330 676.2    144    3156
Processing:  1200 1410 471.4   1232    3240
Waiting:      168  215 176.5    173     964
Total:       1347 1740 848.7   1388    4364

CDN:

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       75   87  26.4     80     196
Processing:   416  481 118.8    440     868
Waiting:       88  119  70.9     99     404
Total:        491  568 139.0    519    1064