Optimization

Toolbelt cleans out some core WordPress features for you. They're little things that aren't used by most sites. There's no harm in having them, but by removing them we:

1. Remove some of the html in the header.
2. Reduce the overhead of generating the content.

Personally, I like to remove the features since I don't use them. If you don't want to do this or need some of the features then feel free to disable the module.

WordPress Features Disabled.