What do you use to make codeigniter app's GUI more usable and faster?

[eluser]CroNiX[/eluser]
For number 1, I'd enable CI page caching. If the cached page exists, most of CI doesn't even have to load like the controllers, models, custom libraries, etc. It just sends the existing cached page. If it doesn't exist, it executes the rest of CI and generates the page for the next time a user accesses it. Then if anything gets updated in the backend (content changes), delete the cached entry for that page/pages and it will regenerate them when a user visits the page next.