Multitasking is a central component of the Android experience. You can open up an application, go open up five more, and go back to the first application right where you left it. Unfortunately, this process doesn’t always work the way you want or need it to. Sometimes it requires a little coercion from an outside source. This is exactly what it takes for HTC EVO 4G LTE owners.
XDA Senior Member Cloaker posted a thread on XDA linking users to an application called mcTweaker Root. After testing the application and some of its settings, Cloaker was able to get multitasking on the EVO LTE working as it should be. As explained:
You have to grant it root permission, go to memory, hit cynic killer, select On.
Hit back, save, restart if asked by the app.
The application is free in the Google Play Store, and given how easy it is to set up and use, this is quite convenient for those who want their multitasking tweaked. What’s more, since this application is available to everyone and has been shown to work on other devices, the tweaked parameters may solve issues on other devices as well.
For more information and the download link to the Play Store, check out the original thread.