> ## Documentation Index
> Fetch the complete documentation index at: https://docs.powersync.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Performance and Limits

> Performance benchmarks and Service limits for PowerSync Cloud.

[PowerSync Cloud plans](https://www.powersync.com/pricing) have the limits and performance expectations outlined below.

The PowerSync Cloud **Team** and **Enterprise** plans allow several of these limits to be customized based on your specific needs.

## Limits

| **Component**                 | **Limit**                                                       | **Details**                                                                                                                                                                                                                                               |
| ----------------------------- | --------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Synced buckets per user**   | Maximum: 1,000 by default; Configurable up to 10,000 by request | Sync requests exceeding this will fail with an error. This limit can be increased upon request for Team and Enterprise customers, however: as the number of buckets exceeds 1,000, performance degrades.                                                  |
| **Maximum row/document size** | 15MB                                                            | Applies to both source database rows and transformed rows synced to clients.                                                                                                                                                                              |
| **Concurrent connections**    | Maximum: configurable (50k+ per instance)                       | PowerSync Service instances have default limits configured based on the [Pricing plan](https://www.powersync.com/pricing). These limits can be increased upon request for Team and Enterprise customers, and currently scale to over 50,000 per instance. |
| **Data hosted**               | Maximum: configurable                                           | PowerSync Service instances have default limits configured based on the [Pricing plan](https://www.powersync.com/pricing). These limits can be increased upon request for Enterprise customers.                                                           |
| **Columns per table**         | 1,999                                                           | Hard limit of the client schema, excluding the `id` column.                                                                                                                                                                                               |
| **Number of users**           | No limit                                                        | No hard limit on unique users.                                                                                                                                                                                                                            |
| **Number of tables**          | No limit                                                        | Hundreds of tables may impact startup and sync performance.                                                                                                                                                                                               |

## Performance Expectations

### Database Replication (Source DB → PowerSync Service)

* **Small rows**: 2,000-4,000 operations per second
* **Large rows**: Up to 5MB per second
* **Transaction processing**: \~60 transactions per second for smaller transactions
* **Reprocessing**: Same rates apply when reprocessing Sync Streams/Sync Rules or adding new tables

### Sync (PowerSync Service → Client)

* **Rows per client**:
  * Good performance expected up to 1 million rows per client
  * Up to 10 million rows per client may still work, but this requires testing with the specific SDK
  * Increasing number of rows increases initial sync time, memory usage and database size
* **Sync speed**: Expect a rate of 2,000-20,000 operations per second per client, depending on the client