# Repository Size Calculation Performance Data

The repository size calculation test case evaluates performance when loading the repository sizes displayed under _Settings_ → _Repository_ → _Repositories_. This feature is available for deployments using a PostgreSQL database.

## Repository Size Performance Test Environment

All repository size calculation performance tests used the same Nexus Repository node, RDS instance (m5d.2xlarge), and PostgreSQL database containing ~3.2 million components (15 million assets).

The instance had two types of repositories:

- small repositories (~250MB) identified as maven-central-{number}
- large repositories (~2.2GB) identified as maven-snapshot-{number}

## Performance Results for Initializing Repository Size Calculations

During our performance testing, it took Nexus Repository the following lengths of time (in milliseconds) to calculate the sizes of given repository sets:

- First 20 Repositories - 92,624ms
- Second 20 Repositories - 92,311ms
- Third 20 Repositories - 86,921ms
- Fourth 2 Repositories - 149,855ms

This cumulates to a total **421,713 ms (421.71 seconds or 7.03 minutes) initial repository size calculation time**. Notably, calculation time for 2 repositories was not any less than calculation time for 20 repositories.

## Performance Results for Updating Repository Size

Performance testing for updating repository size returned the following results:

| Repositories for which Size was Updated | Size Calculation Time (in milliseconds) |
| --- | --- |
| - maven-snapshot-23<br>  <br>- maven-central-6<br>  <br>- maven-central-16 | 93,526 |
| - maven-central-14<br>  <br>- maven-snapshot-30 | 62,077 |

This resulted in a **77-second average size calculation time** for updating repository size.

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