According to “The Register” almost all Intel CPUs sold in the last decade suffer from a massive design flaw that can compromise the security of the machine.
To fix this, all major operating systems have to be updated accordingly. The problem: These security updates might mean a decrease in CPU performance of up to 35 percent, depending on the respective CPU model. This may very well also hit common virtualisation environments including Amazon EC2 and Google Compute Engine, render farms etc.
AMD CPUs are not affected, yet it is unclear as of now if those security updates will be forced upon AMD systems running Windows as well. AMD has supplied a kernel patch for Linux that stops those updates from being applied.