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What is Meltdown and Spectre?
Windows KB Page
Blog on Altaro containing some performance tests with pre/post-patch machines https://www.altaro.com/hyper-v/meltdown-spectre-hyperv-performance/
For any further information about PTC’s reaction to the Meltdown&Spectre, please reference this link: https://www.ptc.com/en/support/article?n=CS277711