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This question already has an answer here:

The patches related to the mitigation of meltdown and spectre attacks, have they caused significant and noticeable slow down of execution in systems they have been applied to?

marked as duplicate by Stephane, M'vy, Community Jan 9 '18 at 9:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Actually, performance loss is one of the few things that isn't covered in that answer @M'vy. – GdD Jan 9 '18 at 9:13
  • I know, but the idea is to gather these questions and get the answers in the same place. It should be added there, even as a new answer to that particular point. I'd advise to merge the answers there. – M'vy Jan 9 '18 at 9:18
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The full impact isn't known yet. It is also going to differ massively based on workload - code invoking large numbers of system calls is likely to invoke a notable hit whilst any difference to code mostly operating in user mode is unlikely to be measurable.

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There are not that many results, but for example Epic Games released a blog post that shows doubled CPU load on one of there cloud servers after installing the Meltdown mitigation. This is definitely significant and noticeable. But the overhead depends heavily on the workload. If it is noticeable by you can only be found out by you after patching.

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