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PowerSync Cloud plans 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.

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Limits

ComponentLimitDetails
Synced buckets per userMaximum: 1,000 by default; Configurable up to 10,000 by requestSync 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 size15MBApplies to both source database rows and transformed rows synced to clients.
Concurrent connectionsMaximum: configurable (50k+ per instance)PowerSync Service instances have default limits configured based on the Pricing plan. These limits can be increased upon request for Team and Enterprise customers, and currently scale to over 50,000 per instance.
Data hostedMaximum: configurablePowerSync Service instances have default limits configured based on the Pricing plan. These limits can be increased upon request for Enterprise customers.
Columns per table1,999Hard limit of the client schema, excluding the id column.
Number of usersNo limitNo hard limit on unique users.
Number of tablesNo limitHundreds of tables may impact startup and sync performance.

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Performance Expectations

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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 rules or adding new tables

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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