Check out these two interesting webinar videos on "Best practices, tips, and tricks with DevExpress ASP.NET controls".
Part 1
In part 1, you'll learn about best practices, caching, and charts optimization:

Part 2
In part 2, you'll learn tips and tricks related to CSS footer, button links, ASPxGlobalEvents control, trackbar+chart control, and Bing maps:

Demo source code
You can download the source code of the demos here:
Links:
Here's the links mentioned in the webinars:
From Part 1:
OLTP vs. OLAP
Create First OLAP Cube in SQL Server Analysis Services - CodeProject
create olap cube - Google Search
OLAP Multiple Totals - ASP.NET AJAX OLAP Data Mining Control Demo | DevExpress
Large Database (Server Mode) - ASP.NET AJAX OLAP Data Mining Control Demo | DevExpress
Online transaction processing - Wikipedia, the free encyclopedia
Online analytical processing - Wikipedia, the free encyclopedia
Binding to Large Data (Database Server Mode) - Online Documentation - Developer Express Inc.
From Part 2:
Sticky Footer | CSS-Tricks
CSS position property
ASPxGlobalEvents Members - Online Documentation - Developer Express Inc.
ControlsInitialized Event - Online Documentation - Developer Express Inc.
BrowserWindowResized Event - Online Documentation - Developer Express Inc.
DevExpress Search - ASPxGlobalEvents sample code
Don's blog post is helpful too.
Thanks!
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