Englishification

README.md

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-Kingfisher is a lightweight and pure Swift implemented library for downloading and caching image from the web. This project is heavily inspired by the popular [SDWebImage](https://github.com/rs/SDWebImage). And it provides you a chance to use pure Swift alternation in your next app.
+Kingfisher is a lightweight and pure Swift implemented library for downloading and caching image from the web. This project is heavily inspired by the popular [SDWebImage](https://github.com/rs/SDWebImage). And it provides you a chance to use pure Swift alternative in your next app.
 
 ## Features
 
-* Everything in Kingfisher goes asynchronously, not only downloading, but also caching. That means you will never worry about blocking your UI thread.
-* Multiple-layer cache. Downloaded images will be cached in both memory and disk. So there is no need to download again and this could boost your app dramatically.
-* Cache management. You can set the max duration or size the cache could take. And the cache will also be cleaned automatically to prevent taking too much resource.
+* Everything in Kingfisher is asynchronous, not only downloading, but also caching. That means you never need to worry about blocking your UI thread.
+* Multiple-layer cache. Downloaded images will be cached in both memory and disk. So there is no need to download again,  this could boost your app's perceptual speed dramatically.
+* Cache management. You can set the max duration or size the cache takes. From this, the cache will be cleaned automatically to prevent taking too many resources.
 * Modern framework. Kingfisher uses `NSURLSession` and the latest technology of GCD, which makes it a strong and swift framework. It also provides you easy APIs to use.
 * Cancelable processing task. You can cancel the downloading process if it is not needed anymore.
 * Independent components. You can use the downloader or caching system separately. Or even create your own cache based on Kingfisher's code.