If performance is your issue, I would get rid of Windows 11 and install Windows 10.

While there are ways to get around Microsoft's minimum requirements (as you obviously did), you face two issues:

• Microsoft has stated that at some point they may enforce the requirements so that systems that don't meet the requirements would no longer receive updates for Windows 11.
• Windows 11 performs poorly on many older systems.

Windows 10 should run better on your system than Windows 11 does.

I agree, but is it normal to take 80 seconds to boot up completely with OS you use?

45 seconds to load a webpage? 12 seconds for a R click to show the options?

Or is it unusually long?

No, that is not normal on the OS that I use. I run Windows 10 on two 11-year-old laptops and they perform those tasks much faster than the times you quoted.

My best advice is that you perform a clean install of Windows 10 using Microsoft's Media Creation tool.

Win 11 operates the same speed on laptops as Win 10, that is irrelevant
 I asked about on a Dell Wyse Dx0d microbox that can run Citrix and ThinOs