Hello,

I recently installed Raspbian with kernel version 3.12.22+ and the GUI was running very well even at high resolution. However, after i ran the rpi-update (after running apt-get update & upgrade), upgrading the kernel to version 3.12.26+ the mouse input has started lagging a lot. When moving the mouse around the CPU load increases to 25%, not sure if that was the case before the update. I am using a Microsoft wireless comfort 5000 keyboard and mouse. Other mice works well with almost no input lag. I don't understand why upgrading the system would reduce performance this much.
How should i proceed to solve this issue? I don't really want to go back to the 3.12.22 kernel since I need some of the new stuff for creating device drivers.

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://www.raspberrypi.org/forums/viewtopic.php?t=84999
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Thank you.