docs(readme): Add time difference (#21)

README.md

@@ -16,7 +16,7 @@ React Native mocks for testing. It is the same as the internal Jest-based mocks
 
 Testing on React Native is not such a trivial task, mainly because some modules and components communicate directly to native code (iOS, Android, etc.) However, in a testing environment like Node.js, the native code is unavailable. Also, React Native code is not delivered in a distributable manner -- most of the code in Flow, and some modules need to go through a haste map resolver (modules with `.ios.js` and `.android.js` prefix, required without the prefix).
 
-React Native solves this problem with [Jest](https://jestjs.io/), providing Jest mocks for native modules. Jest transpiles the code before running it, so there's also a Flow preset in the configuration and some settings to solve the haste map. React Native then exports this configuration as a [Jest preset](https://github.com/facebook/react-native/blob/main/packages/react-native/jest-preset.js) for developers to use with their Jest configuration.
+React Native solves this problem through [Jest](https://jestjs.io/), providing Jest mocks for native modules. Jest transpiles the code before running it, so there's also a Flow preset in the configuration and some settings to solve the haste map. React Native then exports this configuration as a [Jest preset](https://github.com/facebook/react-native/blob/main/packages/react-native/jest-preset.js) for developers to use with their Jest configuration.
 
 But what if you don't want to use Jest as your testing framework? What if you don't need Babel because you already have TypeScript, and your test can run on [ts-node](https://typestrong.org/ts-node/)? Is it even possible to test React Native code without Jest? This package aims to solve this problem by providing mocks the same way as React Native does but without Jest dependency in the middle. It solves the "haste map" modules and transforms Flow code on the fly, caching the result so subsequent executions are 6x faster. Overall, the package makes it possible to test React Native in other frameworks, like [Mocha.js](https://mochajs.org/).
 
@@ -33,7 +33,9 @@ But what if you don't want to use Jest as your testing framework? What if you do
 
 ### Features
 
-- Fast and simple. Transforms just what it needs, when it needs.
+- Fast and simple. It transforms just what it needs when it needs it.
+  - **6x** faster _before_ cache.
+  - **12x** faster _after_ cache.
 - Compatible with [@testing-library/react-native](https://callstack.github.io/react-native-testing-library/) renderer.
 - Extensive range of compatibility by imitating React Native's original mocks.
 - Testing framework agnostic.