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


Some linux benchmarks:
https://www.phoronix.com/scan.php?page=article&item=linux-415-x86pti&num=1

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:
https://meltdownattack.com/

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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”

https://www.epicgames.com/fortnite/forums/news/announcements/132642-epic-services-stability-update

Also there is an Meltdown exploit in the making?