> ## Documentation Index
> Fetch the complete documentation index at: https://powersync-docs-coolify-scaling-note.mintlify.site/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 | Two limits apply per connection, both defaulting to 1,000: unique buckets and parameter query results before deduplication. Exceeding either causes sync to fail with `PSYNC_S2305`. Both limits can be increased for Team and Enterprise customers on request, but higher limits can reduce performance. See [Bucket Count and Limits](/sync/streams/bucket-count). |
| **Maximum row/document size** | 15MB | Applies to both source database rows and transformed rows synced to clients. |
| **Concurrent clients** | 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
* **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