Cpanel has announced a few changes that will increase the perfomance of Round Cube, dealing with a growing number of reports regarding excessive CPU usage. The changes have been applied to the Beta Build. And Cpanel will publish these changes to the Edge Build soon.
Round Cube is a very attractive webmail software, due to it’s AJAX features. I hope they can optimize it’s resource usage. You can’t rely on a webmail software that undermines the server’s perfomance.