Latency Simulator
Analyze p50, p95, and p99 latency percentiles and tail-latency distributions.
p50
50ms
p95
185ms
p99
297ms
Tail ×
5.9×
Latency distribution
min
3.2ms
mean
68ms
p50
50ms
p90
138ms
p95
185ms
p99
297ms
How this simulator works
A latency distribution is not the average — it is the tail. Draw samples from a log-normal model and read p50/p95/p99 directly off the histogram.
Why percentiles, not averages
The mean is dominated by the long tail and hides the experience of most users. p50 is the median request; p99 is what your slowest 1% of requests feel.
Tail latency
- Tail ratio = p99 / p50. A ratio of 10 means the worst 1% are 10× the median.
- A heavier tail (higher spread) inflates p99 far more than p50.
- Capacity planning that ignores p99 ships outages under load.