SpeedBoost was supported by vista through windows 10, and although windows 11 regognises a speed boost USB, I do not know it it uses it. When I put windows 11 on two i5 8gb machines and plugged in two speed boost drives, it did not swap a lot to them, whereas in windows 7, under memory load it would use them, at least until I found ChacheMem v2.1 it would manage memory much better than windows ever could.

Windows back to window 2.1 386 supported swapdisks, i.e fake ram.