Earlier quoted context omitted.
Cutting latencies by 40x! Unfortunately couldn't fit the whole title in the character limit :<
How can you cut latency by more than 1x? I am no intending to be snarky, it just doesn’t fit my brain how you can reduce a measure time by more than the original starting time.
There are two ways to express such ratios, and both are equally valid. (Though "x" is usually reserved for "40x" and "%" for "97.5%".)