JSON is no longer the fastest option for data serialization in web browsers, as recent benchmarks show that binary formats like Avro, Protobuf, and Bebop can outperform it. Factors such as improved internet speeds, the complexity of web applications, and user demand for responsiveness make deserialization performance increasingly important. After testing various libraries, the author concludes that while some binary encodings have advantages, careful consideration of benchmarks and use cases is crucial for selecting the right option.