key

[EugenioUrru]

In September 2023, I purchased an HP 250 G9 notebook. Everything seems to work fine, but often the keyboard suddenly slows down. I have tried everything, including driver updates, using an external keyboard, and running checks with "sfc /scannaw" and DISM. I have also disabled hardware acceleration in the programs. Currently, I am in clean boot mode, and most of the time everything works until I start software such as Thunderbird or browsers (Opera, Firefox). I am considering a complete reset. Any suggestions on how to resolve this?

[erico]

An outdated driver can cause perceptible keyboard lag.

There is nothing wrong with using hardware acceleration. 

Check at the driver & software portal for your laptop to ensure that your drivers are up to date. See the link below.

https://support.hp.com/us-en/drivers/hp-250-15.6-inch-g9-notebook-pc/2101122473

[EugenioUrru]

I tried to check the drivers, and it says that the best available version is already installed. I attempted to re-enable hardware acceleration in some programs, such as the Opera browser. Before starting it, the keyboard does not slow down, but once the browser is launched, the keyboard starts to lag. The same happens with LibreOffice. On the other hand, Thunderbird, despite having hardware acceleration disabled, still causes the keyboard to slow down. What else could I check?

[erico]

Are you using an internet security suite, such as ESET to prevent malware or other bad actors from taking residence in your PC's operating system?

[EugenioUrru]

No. There is no internet security suite installed

[erico]

That could be your problem. I have always used one.

I prefer ESET Smart Suite and have used it for at least ten years.

Run the free ESET Online scanner to see what it finds.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwih7Krz9cmEA...

There might be malware present affecting your laptop's operating system's operation.

MalwareBytes is also a good option

https://www.malwarebytes.com/solutions/virus-scanner

Take a read of the  Microsoft document at the link below.
After carefully reading the document, run Autoruns for Windows to see if there are any third party bad actors(Malware) starting up every time you boot into Windows.

https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns