# web-sys: `performance.now` | |
[View full source code][code] or [view the compiled example online][online] | |
[online]: https://rustwasm.github.io/wasm-bindgen/exbuild/performance/ | |
[code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/performance | |
Want to profile some Rust code in the browser? No problem! You can use the | |
`performance.now()` API and friends to get timing information to see how long | |
things take. | |
## `src/lib.rs` | |
```rust | |
{{#include ../../../examples/performance/src/lib.rs}} | |
``` |