I'm interested in your proposition. Let me help you. -_^

First of all, It's very unusual for a brand new device to behave slow and unresponsive as such. Is this a brand new device or second hand one?

Second, I'm sure you have enabled extra-devel as you said in other post you tried mobilehotspot, which required you to install the kernel power (overclock kernel). Please confirm.

Third, I'd like to check your firmware version. Please go to setting-->about your product, tell me the firmware version.