In a detailed comparison between Ionic and React Native, both platforms are evaluated based on their performance in cross-platform application development. The analysis reveals that while React Native is often perceived as having superior performance due to its use of native UI controls, actual performance tests show negligible differences in boot time and smooth scrolling between the two. Ionic effectively leverages web technologies and offers adaptive styling that aligns with both Android and iOS design standards, ensuring a native look and feel. Additionally, Ionic benefits from Just-in-Time (JIT) compilation, providing faster JavaScript execution and lower CPU and energy consumption compared to React Native, which lacks access to JIT engines. The article concludes that performance should not be the sole factor in choosing between Ionic and React Native, as both can deliver high-performance applications, and suggests that developers choose the platform that best aligns with their preferences and project needs.