The first thing i would recommend to use the Navigation Tabs . This will reduce the amount of load on single page to load .
Only Add "Resources" which you really need to load on the First Tab (Summary Home Page )
Do not overload single Tab with resources .
Netowrk Atlas High resolution MAP background Even not to use any Map background page will load extremely quick
Resource Time Period Try to use the Less Hours / or less amount say Last 10 Events / Last Hour
Use Multiple Navigation Tabs
Move extra load to other tabs you do not need to view on summary page .
move the resources to each Tab / Add more tabs if needed Do not over load single Tab
When using any Resources try to use the Less Hours / or less amount say Last 10 Events / Last Hour
Use Top XX Type of Resources and Try to use less amount to load such as 10 / 5 Top
Try not to use more then 2 Column unless you really need to do that and do not overload with Resources.