It's not the "ck" sound that makes it difficult/slow; it's the "ck" followed immediately by the "d". Both sounds are stops, and stops are somewhat difficult to

It's not the "ck" sound that makes it difficult/slow; it's the "ck" followed immediately by the "d". Both sounds are stops, and stops are somewhat difficult to produce consecutively. Compare with a name like "Conoco", which contains the same sound that you were complaining about in DuckDuckGo twice as well, but is much easier to say because both occurrences of it are preceded and followed by vowels.