MCP Tools: High CPU load

PSU 2026.1.6
Priority: High

When using multiple MCP tools in parallel (e.g. >10) the server CPU load caps at 100% for several seconds and PSU gets unresponsive. Each MCP job spawns a Universal.Host process that consumes approximately 7~10% CPU. These jobs do very light work, most just start an asynchronous REST API call and check for completion with most calls completing in seconds. I'd wager the time it takes for PSU to prepare these jobs is greater than the time it takes for the content of the jobs to finish.

Our AV and EDR tools are surely involved in creating this load and we are testing what happens if they are off or the PSU processes are excluded. But I don't think this will fully fix the problem.

I would like to have the load problem permanently fixed, but for a workaround i would be satisified with a rate limiting for MCP tools.

Can you please - either fix the problem or create a workaround - in the 2026.1.x version family?

This happens on both of these types of machines:

RDP -> VM (dev machine)
Windows Server 2019
local access HTTP
Portable zip
6 cores @ 2.80GHz
24GB RAM

LB -> VM (test machine)
Windows Server 2022
remote access HTTPS with official cert
MSI install
4 cores @ 2Ghz (restricted by hypervisor policy)
8GB RAM

I haven't tested it yet on our prod cluster, but i would expect the same:

LB -> 2 VMs
Windows Server 2022
remote access HTTPS with official cert
MSI install
4 cores @ 2Ghz (restricted by hypervisor policy)
8GB RAM