# Performance ## Performance Architecture The KendoReact Grid leverages a sophisticated performance architecture built on modern React patterns and optimized rendering strategies: * **Intelligent DOM Management**: Minimizes DOM operations through strategic element reuse and efficient rendering cycles * **Memory Optimization**: Smart data handling that prevents memory leaks and reduces garbage collection overhead * **Render Optimization**: Advanced reconciliation algorithms that update only changed elements * **Event Handling Efficiency**: Optimized event delegation and handling for maximum responsiveness ## Core Performance Features The KendoReact Grid offers several powerful performance optimization features: * **[Virtual Scrolling (row virtualization)](https://www.telerik.com/kendo-react-ui-develop/components/grid/scroll-modes/virtual)**—Only renders visible rows plus a buffer, enabling the Grid to handle millions of records with consistent performance and minimal memory usage (enabled by default for licensed users as of v11.0.0). * **[Column Virtualization](https://www.telerik.com/kendo-react-ui-develop/components/grid/optimization/column-virtualization)**—Renders only visible columns dynamically during horizontal scrolling, significantly reducing DOM elements for datasets with many columns. * **[Paging](https://www.telerik.com/kendo-react-ui-develop/components/grid/paging)**—Renders only data for the current page, ideal for analytical interfaces and SEO-friendly scenarios. It could be combined with virtual scrolling. * **[autoProcessData](https://www.telerik.com/kendo-react-ui-develop/components/grid/api/gridprops#autoprocessdata)**—Built-in data processing that handles sorting, filtering, grouping, and paging automatically, reducing boilerplate code and improving maintainability. > When testing the performance of the KendoReact Grid, make sure to use a production build. React is significantly faster when using a production build, providing a more accurate representation of end-user experience. The following example demonstrates a high-performance Grid with 1,000 rows and 10 columns, using paging and an on-demand data generation tool to measure rendering throughput. [Demo Source](https://demos.telerik.com/kendo-react-ui/grid/performance/basic/func/source.txt) ### Virtual Scrolling Performance **[Virtual Scrolling](https://www.telerik.com/kendo-react-ui-develop/components/grid/scroll-modes/virtual)** is the primary performance optimization technique for handling large datasets in the KendoReact Grid. This feature renders only the visible rows plus a buffer, enabling seamless handling of millions of records with constant memory usage. **When to Use:** * Datasets with 1000+ rows * Applications requiring real-time data updates * Mobile applications with memory constraints * Any scenario where initial loading performance is critical **Performance Benefits:** * **Constant Memory Usage**: Memory consumption stays consistent regardless of data size * **Fast Initial Rendering**: Only renders visible content, dramatically reducing initial load time * **Smooth Scrolling**: Maintains 60fps performance during scroll operations * **Reduced DOM Size**: Keeps DOM lightweight for better browser performance This demo below showcases virtual scrolling (row virtualization), which renders only visible rows plus a buffer. This enables the Grid to handle millions of records with consistent performance and minimal memory usage. ### Combined Virtualization (Rows + Columns) **[Column Virtualization](https://www.telerik.com/kendo-react-ui-develop/components/grid/optimization/column-virtualization)** optimizes horizontal scrolling performance by rendering only visible columns, making it ideal for wide datasets with many columns. **When to Use:** * Datasets with 50+ columns * Wide tables with varied column widths * Dashboard applications with many data points * Reporting interfaces with extensive column sets **Performance Benefits:** * **Horizontal Scroll Performance**: Maintains smooth horizontal navigation regardless of column count * **Memory Efficiency**: Reduces memory footprint for wide datasets * **DOM Optimization**: Keeps horizontal DOM size manageable * **Combined with Virtual Scrolling**: Maximum performance for both rows and columns ### Paging Performance **[Paging](https://www.telerik.com/kendo-react-ui-develop/components/grid/paging)** provides predictable performance by rendering only the current page of data, making it ideal for analytical interfaces and SEO-friendly applications. **When to Use:** * Analytics and reporting interfaces * SEO-friendly applications requiring static URLs * Applications with user-controlled data consumption * Interfaces where users expect traditional page-based navigation **Performance Benefits:** * **Predictable Performance**: Consistent rendering time regardless of total data size * **Memory Efficiency**: Only current page data is held in memory * **User Control**: Users can adjust page size based on their needs The following example demonstrates a high-performance Grid with virtual scrolling and configurable row and column counts, where you can select from preset options to measure rendering performance across different dataset sizes. [Demo Source](https://demos.telerik.com/kendo-react-ui/grid/performance/virtual/func/source.txt) ## Performance Best Practices ### Development Guidelines 1. **Always Use Production Builds**: React development builds include extensive debugging overhead. Production builds can be 3-6x faster and provide accurate performance measurements. 2. **Choose the Right Strategy**: * Use **Virtual Scrolling** for 1000+ rows with consistent row heights * Use **Column Virtualization** for 50+ columns or wide datasets * Use **Paging** for analytical interfaces * Combine strategies for maximum performance with large, wide datasets 3. **Optimize Cell Renderers**: Memoize custom cell components and avoid inline functions in render methods to prevent unnecessary re-renders. 4. **Manage State Efficiently**: Use appropriate state management patterns, implement proper memoization, and avoid unnecessary re-renders. ### Data Operations * Prefer `autoProcessData` for built-in sorting, filtering, grouping, and paging to minimize manual logic and improve maintainability. * Trigger sorting and other data operations only in response to user actions, not on every render. * Debounce remote data requests to reduce unnecessary API calls and improve responsiveness. * Update Grid state after editing is complete, rather than on every cell change, to minimize re-renders. * Define custom components (such as cells or rows) outside the main Grid component to prevent unnecessary re-renders of child components. ## Modern Optimization Features ### AutoProcessData The `autoProcessData` feature eliminates the need for manual data processing by handling sorting, filtering, grouping, and paging automatically within the Grid component. ```jsx ``` This approach reduces boilerplate code, improves maintainability, and ensures optimal performance through built-in optimizations. ### React Server Components (RSC) Mode For Next.js applications, the Grid's RSC mode provides significant performance benefits: * **Server-side data processing** - Offloads expensive operations from the client * **Reduced bundle size** - Ships only essential JavaScript to the client * **Improved initial load times** - Faster time-to-interactive and first contentful paint * **Better scalability** - More efficient handling of large datasets Learn more about [Grid RSC Mode](https://www.telerik.com/kendo-react-ui-develop/components/grid/rsc-mode) and [RSC Performance Optimization](https://www.telerik.com/kendo-react-ui-develop/components/grid/rsc-mode/performance). ## Performance Testing & Monitoring **Testing Strategy:** * Start with small datasets (100 rows, 5 columns) to establish baseline * Gradually increase dataset size to identify performance thresholds * Test different optimization strategies (virtual scrolling vs paging) * Compare development vs production build performance * Test on target devices and browsers **Key Performance Metrics:** * **Initial Render Time**: Time from mount to first paint * **Scroll Responsiveness**: Maintain 60fps during scroll operations * **Memory Consumption**: Monitor memory usage patterns and leaks * **Interaction Latency**: Response time for user interactions (sorting, filtering) * **Bundle Size Impact**: Measure JavaScript bundle size impact **Performance Testing Tools:** * **React Profiler**: Built-in React [performance profiling](https://react.dev/reference/react/Profiler) with React 18+ concurrent features * **Chrome DevTools**: Comprehensive browser performance analysis * **Lighthouse**: Core Web Vitals and performance scoring * **Web Vitals Extension**: Real-time performance monitoring * **React DevTools Profiler**: Component-level performance insights > We advise testing with a production build as well. That shows the real power of the KendoReact Grid with up to 6 times improved performance compared to when testing with a development build. ## Suggested Links * [Grid RSC Mode](https://www.telerik.com/kendo-react-ui-develop/components/grid/rsc-mode) * [RSC Performance Optimization](https://www.telerik.com/kendo-react-ui-develop/components/grid/rsc-mode/performance) * [Virtual Scrolling](https://www.telerik.com/kendo-react-ui-develop/components/grid/scroll-modes/virtual) * [Column Virtualization](https://www.telerik.com/kendo-react-ui-develop/components/grid/optimization/column-virtualization) * [Data Query Overview](https://www.telerik.com/kendo-react-ui-develop/components/dataquery) * [API Reference of the Grid](https://www.telerik.com/kendo-react-ui-develop/components/grid/api/gridprops) * [API Reference of the GridToolbar](https://www.telerik.com/kendo-react-ui-develop/components/grid/api/gridtoolbar) * [API Index of the Grid](https://www.telerik.com/kendo-react-ui-develop/components/grid/api)