Views

All Views-generated queries will include a special 'VIEWS' = 'VIEWS' string in the WHERE clause. This makes identifying Views queries in database server logs simpler, but should only be used when troubleshooting.

Views caches data about tables, modules and views available, to increase performance. By checking this box, Views will skip this cache and always rebuild this data when needed. This can have a serious performance impact on your site.

Views uses the advanced help module to provide help text; if this module is not present Views will complain, unless this setting is checked.

The live preview feature will show you the output of the view you're creating, as well as the view. Check here to show the query and other information above the view; leave this unchecked to show that information below the view.

Drupal has the potential to run many queries while a view is being rendered. Checking this box will display every query run during view render as part of the live preview.

To make it easier to administrate your views, Views provides 'hover' links to take you to the edit and export screen of a view whenever the view is used. This can be distracting on some themes, though; if it is problematic, you can turn it off here.

Check this to enable some Views query and performance statistics if Devel is installed.

If you are having problems with the javascript, you can disable it here; the Views UI should degrade and still be usable without javascript, it just not as good.