My CPU use is similar to what it was pre-patch.
Also
@fenderman, I wouldn't call the patch itself overblown.
The worry about whether it will reduce your performance is overblown unless you're running software that makes a lot of calls to the kernel, but the exploits uncovered yesterday are true game-changers. January 2018 will be an inflection point for Intel and AMD where they were forced to make radical changes to future chip designs and to start designing for security first before designing for raw speed.