Not the parent, but I do not see that Intel is wrong here. New architecture makes new choices and, according to the redlined doc, they expect 1-2% performance

Not the parent, but I do not see that Intel is wrong here. New architecture makes new choices and, according to the redlined doc, they expect 1-2% performance improvements on threaded apps, which is a measurable improvement. They also explicitly call for possible degradation cases so folks who care can adjust. .NET apparently hits such a degradation case, but parent says this is due to .NET implementing spin loops in a way (almost) no one else does. If so, in this particular case Intel is doing the greatest good for the greatest number, which is reasonable. My 2c.