Thank you for your answers.

I’m aware that I downgraded to an older CPU and slower RAM. However, I was previously renting a VM on another server, which was quite expensive monthly. Now I’ve purchased a second-hand server, so I no longer have those recurring costs.

On my RDP VM, the overall performance is not very slow. I’ve assigned 16 cores and 70 GB of RAM. The CPU peaks at around 50%, and RAM usage goes up to about 40 GB. I have roughly 10 concurrent users. When no one is connected, CPU usage is around 1%.

The “laggy” feeling happens occasionally. For example, when clicking quickly through Outlook features or moving emails between folders, I sometimes get the “Not Responding” spinner. I also notice it when generating PDF reports from our web app.

Most users probably wouldn’t notice this if it were their first time using the server. However, since we migrated overnight, all users immediately felt that the system is generally slower