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Quite possible some of the side-channel hotfixes have been applied? https://www.citrix.com/blogs/2019/05/14/microarchitectural-data-sampling-security-issues-and-mitigations/ We know the scalability impact is significant for them.

thanks Martin!! i see that the blog call this out: "Citrix Consulting is also offering hands-on assistance with the mitigation process for vulnerability issues identified in CPU architectures." any info that might help me build a strategy for these clients?

Yes, I would reach out to your local consulting team to assist with that. There are also tools that will show you which mitigations are enabled/disabled and you can find some scalability data from go-euc.com

Thank you Martin for all your help. I am working with the client to verify if in fact this is the issue and coordinate with next steps and resolution.