Sorry - Although I think the word 'Metrics' must debunk that implication, I can understand what you mean.

I hope it's clearer now.

was:

   Realtime Metrics with Redis: 128 Million Users + 16MB RAM = 50ms

is:

   Realtime Metrics for 128 Million Users with Redis: 50ms + 16MB RAM

I still think that those user numbers in the title evokes a mental image of a certain type of load with a certain type of response time. I think if you got rid of the response time, it would be less linkbaity, because then it's clear that your focus is on the amount of storage it would take. It's not very important either way.