Intel's processors have a security bug and the fix comes with performance hit

Some linux benchmarks:

Google seems to indicate it may affect AMD and ARM as well as Intel:

Yes it seems there is more than one vulnerability explained very clearly here:

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It seems that the biggest impact of Meltdown fix will be on Server Clouds.
Epic Games reporting “significant impact on CPU usage of one of our back-end services after a host was patched to address the Meltdown vulnerability”

Also there is an Meltdown exploit in the making?