Do you have an unlocked Motorola Droid RAZR HD on Verizon, and do you want to use on some other carrier? You would most likely be using it on one that offers HSPA+ instead of LTE, and doesn’t support fast dormancy. In such a situation, having LTE and fast dormancy enabled on the device would not just be pointless, but also a needless resource hog. That’s why XDA Senior Member pfak found a quick solution to disable LTE and fast dormancy on the device, and force it to use HSPA+ for data.
The hack involves adding a few lines to your build.prop file, Therefore, your device must be rooted for it to work. Furthermore, you’ll need a carrier-unlocked device in order to use it with any other carrier in the first place. That said, you should see a noticeable improvement in performance on such carriers after you apply this hack.
You can find more details about the mod in the forum thread.