The author conducts a detailed performance analysis of Flutter applications when transitioning from JavaScript to WebAssembly (WASM). Expectations of a significant performance boost of up to 50% were not met in real-world scenarios; in practice, the acceleration for large projects was only 5–10%. The article examines which operations benefit from WASM and where JavaScript remains competitive. The author built a dedicated Flutter test bench to identify bottlenecks and understand how computational processes affect UI smoothness. The research challenges official performance claims and offers developers a more realistic perspective on the capabilities of WASM in web development. This article is useful for those planning to optimize their web projects and seeking to understand the nuances of compiling Flutter to WASM.
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