# to-fast-properties [](https://travis-ci.org/sindresorhus/to-fast-properties) > Force V8 to use fast properties for an object [Read more.](http://stackoverflow.com/questions/24987896/) Use `%HasFastProperties(object)` and `--allow-natives-syntax` to check whether an object already has fast properties. ## Install ``` $ npm install --save to-fast-properties ``` ## Usage ```js const toFastProperties = require('to-fast-properties'); const obj = { foo: true, bar: true }; delete obj.foo; // `obj` now has slow properties toFastProperties(obj); // `obj` now has fast properties ``` ## License MIT © Petka Antonov, John-David Dalton, Sindre Sorhus