A fundamental design flaw in Intel's processor chips has forced a significant redesign of the Linux, Mac, and Windows kernels to protect against a chip-level security bug. Microsoft has publicly introduced the necessary changes to its Windows operating system in an upcoming Patch. The effects are still being benchmarked, however we're looking at a likely reduction in performance depending on the task, the CPU, the and the OS.
Primestream has been looking into this issue. We recommend that customers hold off on patching until we complete internal testing of the patches ourselves. In your controlled environment, this should not represent an undue risk to your system. We are starting the process of profiling performance in some key areas to evaluate the impact.
While some early reporting had kernel heavy processes taking as much as a 50% hit in performance, some other reports have the impact much lower, near 3%. We will issue another update on our findings as we complete our testing.