Windows server graphic optimizations

Hello,
i am facing a strange behavior on customer's proxmox installation.
Recently he migrated windows servers vms from hyper-V on brand new proxmox installations.
these virtual machines are used to run a (rather dated) management program to which users connect via remote desktop. in some management software tables the data input is rather slow with strong lag. Trying to deactivate the table colors and lowering the resolution improves performance significantly. however this did not happen...

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