Analysis conducted by SolarWinds on the impact on the performance of the Spectre/Meltdown patches on its own Amazon Web Services infrastructure revealed serious performance degradation. The company has graphically represented performance of a Python worker service tier on paravirtualized AWS instances. The packet rate drops up to 40% on its Kafka cluster, while CPU utilization spiked by around 25 percent on Cassandra. CPU usage jumped up to roughly 25% just after Amazon restarted the PV instance used by the company.”]
Source: https://securityaffairs.co/wordpress/67767/security/meltdown-patches-aws-impact.html