app lagging on entering text in TextBox on Windows11Pro64-Bit

Hello,
I have a simple app that uses mdb as a database created in vb6.
For years the app is working perfectly and without a problem on any Windows machines.
Now the customer has bought a powerful machine and the app is lagging on entering simple text into the TextBox, every few seconds for a 2 to 3 seconds while typing the text. The whole app freezes for a second or 2 every few seconds.
No code events are firing on this textbox change or keyup, down,.... events.

The spec for this computer are:
Intel s1700 i9-14900 + 64 GB RAM + 2*960GB + 2TB + 700w
Operating system installed:
MS FQC-10524 ”OEM*Windows11Pro64-Bit

The machine is new (3 months old)
Nothing is running in the background. They use only Office and this vb6 app on it.

I tried with compatibility settings but nothing.
Tried to remove all from the startup, but nothing.
The CPU, I/O, network, no spikes in Task Manager.
Turned off Windows Defender,
Turned off the Windows update,
Tried with unplugged from the local network and from the internet, but nothing.

Very strange, a simple text input on a new strong machine lagging on entering text.

Any Ideas?

Whenever this has happened to one of my VB6 program it has turned out to be an external problem, often due to a/v tools. Are you sure Defender is really off? Did you reboot afterwards?

Did you attempt to set an exclusion for the folder within Defender?
Is there any other a/v tool that you are unaware of?

Have you tried installing on another machine with the same spec./config.?

Try disabling DEP (Data Execution Prevention)