It depends on the use case (e.g., how much you're interacting with web APIs) but I'd generally expect this to be the case for data processing at least. During

It depends on the use case (e.g., how much you're interacting with web APIs) but I'd generally expect this to be the case for data processing at least. During compilation from Rust to WebAssembly you have the opportunity to apply ahead-of-time optimizations that would be too expensive or impossible to apply to JavaScript during execution, so this can improve performance pretty significantly over JavaScript.