I suspect you are using synchronous operations, with a potentially slow network in between. Here’s a few things to look at:
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What’s the ping time between the application server and the Couchbase cluster? If I had to make a guess I’d assume your network round-trip is something like 150ms (1.0s/6 = 166ms).
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How long does the Couchbase SDK believe the operations are taking - you should be able to enable logging in the application to see this.