Windows Server 2019 - CPU load increases after disconnecting RDP session

[RobalexGaming]

Hello. I have a problem with Windows Server 2019 Datacenter, up-to-date with Windows Update. When I'm connected to the server via RDP, CPU load is very small (7-9%). When I disconnect, the CPU load goes up to around 30-40%. I've experimented with it and being connected via RDP is the only thing that matters - whenever I'm connected, the load is low, whenever I'm disconnected - it rises. It seems that there was a simillar issue with Windows 10 some time ago.

Specs:
i5-2500
No dedicated GPU
Gigabyte P-61-S3
Toshiba HDD SATA2
8GB DDR3

It's a big issue for me, how to fix it?

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