For folks starting to play with the GP 2013 beta web client, Jivtesh offers some Dynamics GP 2013 Web Client Beta Troubleshooting tips. Keep in mind that this is beta software and performance optimization usually comes at the end of the cycle before release.
About Dynamics, Development and Life: Dynamics GP 2013 Web Client Beta Troubleshooting
Install, Upgrade & AdminGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.