Euan WilliamsInterested members can access Intel's Statement here.
Appleinsider comments :
"Despite Intel explicitly denying that it is a bug in its statement, Apple, Microsoft, and others are already dealing with the problem. Apple has already at least in part rectified the issue in macOS High Sierra 10.13.2 from December, with Microsoft apparently having a patch in the works for Windows 10." [More patches expected with 10.13.3].
More detail information from Appleinsider here too.
Slowdowns due to patches seem currently not to Affect High Sierra - so far. Nice to see Apple ahead of the game :)