If you subsequently turn hyper-threading off, you'll lose around five to six percent performance until you re-install the operating system in single-processor mode.

OK this is probably a dumb question. Where do you turn on hyper threading? When I ordered my Dell there was a box that says check here if you want it turned on from the factory. Well I didnt, but ...

A new security report indicates issues with Hyper-Threading can leak cryptographic information in certain cases, but evidence points against this being a Spectre or Meltdown-class failure.