WebAssembly Performance: Maintaining Silky-smooth Web Apps The many benefits of Rust also come with a steep learning curve, so choosing the right programming language depends on a variety of factors, such as the makeup of the team that will be developing and maintaining the code. This means that Rust code is fully in control of when memory is allocated and cleaned up, allowing consistent performance-a key requirement in real-time systems. This can lead to simpler error handling and a higher chance of maintaining a good UX when unanticipated issues occur. When compared to other languages, Rust performs extra safety checks while compiling your code, vastly reducing the potential for crashes caused by empty or uninitialized variables. Rust provides near C/C++-level performance, yet has a very safe memory model.Rust has excellent Wasm support, supporting high-level interoperability with JavaScript.First and foremost, Rust has a small runtime which means less code is sent to the browser when a user accesses the site, helping keep the website footprint low.But the reasons to use Rust with WebAssembly go beyond mere trendiness: Rust occupies the top spot for “most-loved language” in the 2020 developer survey from Stack Overflow. Rust was created by Mozilla in 2010 and is growing in popularity. While many programming languages compile to Wasm, I chose Rust for this example. If your team prioritizes keeping development and continuous integration tooling as simple as possible, using Wasm will run counter to this. Typical uses of WebAssembly require adding tools, such as a language compiler, into your toolchain.Older browsers such as Internet Explorer do not support Wasm directly.For simple projects, sticking with JavaScript, HTML, and CSS will likely deliver a working product in a shorter time.The popularity of WebAssembly will surely continue to grow however, it’s not suitable for all web development: This has the potential to bring web application performance characteristics much closer to native experiences for both mobile and desktop. Depending on the choice of language used, Wasm is able to operate at near-native speeds.This includes making use of existing libraries (numerical, audio processing, machine learning, etc.) that are written in languages other than JavaScript.It allows executing code inside the browser that was written in conceivably any language.There are several reasons why it might make sense to use WebAssembly: Note: If you’re more interested in the “how” than the “why” of this article, feel free to jump straight into the tutorial. Tying it all together into a bare-bones React application.
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