SOFT FOR YOUА чего тогда TMonitor не реализовали поверх критической секции? )
Для кого ссылки-то давали:
With just that one simple change, TMonitor is matching and even sometimes now exceeding the performance of the Windows critical section. On the whole, I’d declare them equivalent. This does, however, mean you will need to explicitly set the spin count on the TMonitor to some value. Normally the “right” value is a guess based on empirical testing for your specific use case. I suspect the Windows critical section code selects some value based on the number of cores and CPU speed. At some point, I'll need to research an algorithm that can automatically select a reasonable spin count.

There is one thing I can say that TMonitor has over the Windows critical section… it works on all platforms (Windows, MacOS, iOS, and soon Android). Feel free to use whichever one you feel more comfortable using for your specific situation. Me? I will fully admit I’m biased…