I don't recommend doing this, and you need to be prepared to clean install back to Windows 10.
That said, MY Surface Pro 3 has been in the Insiders Dev channel since day 1 and I am not seeing crashes or issues. I'm quite frankly surprised as to how well Windows 11 runs on this SP3.
I appreciate the two replies, but I don't think they recognize the real problem here.
When Windows 10 came out and I upgraded older laptops, their performance actually improved. In my opinion (and I think it was also the opinion of the community at the time) Windows 10 did more with less.
It's nice to know I can go against Microsoft's recommendations and install Windows 11 on my Surface Pro 3 and 4 by twisting myself into knots and then having to deal with any technical problems that arise on my own. I have a degree in computer science and I've worked through a very large number of computers and operating systems in the past 50 years. I can do that sort of thing if I have to.
But I've drifted away from being a techie, first into finance, then into teaching high school debate and running tournaments. Microsoft work-arounds are not what I want to do. I prefer the path of least resistance.
Windows 10 was a performance improvement. If Microsoft does not recommend Windows 11 for laptops it designed and sold within the last 5 years, then they are telling me that compared to 10, 11 is a CPU hog. What other conclusion is there?