XDA Developers found out that by modifying the registry you can make Opera Mobile free up memory at its closing. After using Opera Mobile and exiting the application, you might notice in your Task Manager (other than HTC Task Manager) that its process is still running in the background until you kill it.

You need to edit your registry at HKEY_LOCAL_MACHINESoftwareOperaPreload and change the value of “RealExit” from “0″ to “1″. This would prevent Opera Mobile’s process from staying memory resident after exiting the application and forcing it to really exit, thus clearing up some memory space.

Note: In case you don’t have this registry hierarchy, create it. RealExit should be DWord.

Note 2: If you’re not into Registry editing, you can simply install this cab that will do the work for you.