View retrieval by key response times

[pfortin-urbn]

I have a KTable that contains 980+ million entries in out staging instance - I've create a view over it to be able to extract the ktable data at will. After the initial startup (1.5 hours), I queried the data to checkout the performance and I was surprised at my findings...

If I query data from an entries that was just updated somehow, the response time to retrieve it from the KTable / Local Storage is in the micro-seconds ("duration":"53.122µs") but if I query data that has been at rest in the KTable for 1+ years I get response times in the milliseconds ("duration":"5.095932ms").

I'm wondering why that is, since both entries should come from local key / value storage and I'd expect the same performance for all keys?!