Is 4.16.6 the first version of LW that you've used, or have you used older versions without the CPU problem?
Which OS are you using?
Try updating your Java. Use the JRE
offline installer & remove any other Java versions installed on your computer (via control panel > add/remove programs) before installing the new version.
Java SE Downloads
If changing Java versions doesn't help, in LW go tools > options > advanced > performance > disable DHT capabilities, disable TLS capabilities, disable ultrapeer capablilities > apply > ok. See if that makes any difference.