Diane Valovich, most likely no patch necessary but it will depend on your computer. If this just started, do a scan for spy or malware. Use a free program like Malwarebytes etc. The delay may be caused by not enough resources and I found malware to be one of the bigger offenders. It will of course also depend on what operating system you are using as well as what keyboard (wireless or wired). If it is wireless try a USB keyboard and see if that makes a difference. Furthermore it will also depend if it is just with a particular program or if it is whenever you type anywhere. If you give us more information, we may find a more concise answer. In general you are always looking for causes like this:
a) The computer is bogged down by malware
b) It doesn't have enough memory to run all open applications
c) Failing memory
d) It may need to be defragmented
e) There is a rogue process running that is consuming way too many resources