Since upgrading to Windows 10 from 8.1 my keyboard is getting terrible lag regularly, not all the time but regularly, e.g. especially when entering into a search engine. I have a logitech K260 wirless keyboard. Mouse is OK.

Any ideas/suggestions?

Thanks

Does the lag only happen in a browser?  If so chances are it is a browser add-on.  Care to be more specific?

 Similar issue has been raised in Logitech's Forum:

mouse & keyboard lag in windows 10

http://forums.logitech.com/t5/Mice-and-Pointing-Devices/mouse-amp-keyboard-lag-in-windows-10/td-p/1427163?nobounce