Intel, Microsoft and Linux confirm Meltdown and Spectre patches slow PCs, servers. The fixes carry a performance cost, in part because the “side-channel attacks” exploit a physical feature built into modern microprocessors that speed up operations. Older systems will likely see more pronounced slowdowns. Epic Games blames “recent login issues and service instability” on its Meltdown patches for its Fortnite game, which was first publicly disclosed on Jan. 3. There’s no accurate view yet of the performance costs that patching may incur.”]
Source: https://www.govinfosecurity.com/performance-hit-meltdown-spectre-patches-slow-systems-a-10570