How do you make dashboards load faster? what is the quickest way to do it?
Along with Summary indexing the other alternative option is making a search has made available for later use by creating the savedsearch.
http://docs.splunk.com/Documentation/Splunk/6.2.2/SearchTutorial/Aboutsavingandsharingreports
For 95% of cases, the biggest thing will be to use summary indexing: http://www.splunk.com/wiki/Summary_Indexing
You can also look at things like caching dashboards, referencing existing search jobs, and etc., but it's likely that everything you want will be solved by summary indexing.