API Latency Estimator

The API Latency Estimator helps you calculate expected response times in microservices architectures by modeling network latency, service processing times, database queries, external API calls, and inter-service communication overhead.

This tool provides realistic latency estimates for complex request flows, helping you understand how multiple service hops, synchronous vs asynchronous calls, and network conditions affect overall API performance.

Understanding API latency before deployment is crucial for meeting SLA requirements and ensuring good user experience. This tool helps you identify potential performance bottlenecks early in the design phase and make informed architectural decisions.

Perfect for microservices architects, API developers, and performance engineers who need to estimate end-to-end latency, compare architectural approaches, and set realistic performance expectations for distributed systems.

Architecture Planning: Estimate latency for different microservices architecture patterns before implementation to choose the most performant approach.

Performance Budgeting: Calculate latency budgets for each service in a request chain to ensure overall SLA compliance.

Bottleneck Identification: Identify which services or operations contribute most to total latency and prioritize optimization efforts.

Migration Analysis: Compare latency of monolithic vs microservices architectures when planning system decomposition.

Define your request flow by adding services in the call chain, specify processing time for each service, include database queries and external API calls, and set network latency between services based on your infrastructure (same AZ, cross-region, etc.).

The estimator calculates total end-to-end latency, shows the contribution of each component, identifies the critical path, and provides recommendations for optimization such as caching, async processing, or service consolidation.