convex-realtime

Real-time data subscriptions in a Convex React app use the Convex React client and useQuery hook to automatically sync UI components with database changes without manual polling.

Optimistic updates with Convex mutations provide immediate UI feedback by applying predicted changes locally through the useMutation hook, rolling back automatically if the server request encounters an error.

Cursor-based pagination in Convex works by loading large datasets efficiently in pages using the pagination APIs, fetching subsequent chunks of data based on a cursor reference rather than offset limits.

Yes, you can share query results across components to reduce redundant fetches using Convex smart caching, which stores and reuses subscription data within the React client to avoid unnecessary re-renders.

Unnecessary re-renders with Convex useQuery hooks often occur due to data inconsistencies or improper subscription management, requiring safe reactive patterns and smart caching to normalize state updates.