I have been running Fedora since over one year ago on my Dell Precision 7510. This is a $4,000 laptop. It ran well and quickly until Fedora 28 upgrade. Now, it is laggy and slow on the keyboard. Keystrokes get delayed and then it will do multiple repeats of a key at random. The touchpad and mouse responses are laggy. It is very disappointing to have such an expensive machine running this way. It affects all apps including the terminal command window. Some apps are more affected if they use more CPU, such as Firefox.

System monitor shows no unusual CPU activity.

I already submitted this issue to Bugzilla, but have not gotten any helpful replies.

Any similar experiences? Ideas for how to track down the cause?