Latency Analysis — Guide

Payment latency is not a single number — it is the sum of nine distinct pipeline steps, each with different baseline performance characteristics and different optimisation strategies. End-to-end P99 latency of 2 seconds could be caused by Lambda cold starts, an over-configured WAF, or gateway processing time. The fix is different for each.

This tool lets you enter your observed P50, P95, and P99 latency for each pipeline step, compares them against AWS best-practice baselines, calculates your SLA budget allocation, and generates a prioritised list of optimisation recommendations.

1. Enter your target P99 end-to-end latency in milliseconds. This is your SLA budget — the total time the entire pipeline can take.
2. The tool distributes this budget across the nine pipeline steps and shows you how much headroom each step has.

1. For each pipeline step, enter your measured P50, P95, and P99 latency from CloudWatch, X-Ray, or your APM tool.
2. If you don't have measured values yet, the tool uses the baseline figures so you can see what a well-configured stack looks like.
3. Steps where your P99 exceeds the SLA budget allocation are highlighted in red.

1. The recommendations panel lists optimisations for each breaching step, ordered by estimated impact.
2. Each recommendation includes the specific AWS configuration change or code pattern to apply.
3. Export the full analysis as a report to share with your team or include in a performance review.