[Improv] App performance

[itaditya]

Some ways to improve app's actual performance

1. Certain images are still of 75kb. It appears they haven't been minified.
2. Use CSS spritesheet to display logo of cryptocurrencies on first page.
3. Using async and defer attributes on script tags which are not needed at loading time.

[djirdehh]

Hm these are all solid ideas. Noted and will look into improving these when time permits :)