Dev.to
5/10/2026

Why your app feels slow and how we fixed it with PowerSync
Short summary
Apps feel slow not because backends are slow, but because request-and-wait architectures make UI dependent on network speed. PowerSync solves this by moving the primary data source to local SQLite and syncing changes in the background, making interactions instant. The backend shifts from serving JSON to handling permissions and validation, while partial replication ensures users only receive allowed data.
- •Request-and-wait architecture is the real bottleneck, not backend speed
- •Local SQLite with background sync via PowerSync removes network latency from user interactions
- •Backend becomes validation/permission layer; frontend queries local data directly
Generated with AI, which can make mistakes.
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