I bought an HP 470 ProBook G3 last year, and it generally works well. I suspect it is some software making a difference. I just ran a test after closing Skype, TeamViewer and Glasswire, and the results were actually worse than usual - about 50 or so. My wife also has the same software (including anti-virus, etc) loaded (and usually has FB open), but gets normal results.
If anyone has any ideas on tracking this down I'd appreciate hearing them.