No simple answer, and I'll share my own experience as a rookie bent rider.
Bents are still HPV, so you won't go faster than your engine will allow.
Where you will go lots faster is downhill because of the aero advantage. I routinely pull 35 MPH and I just have rollers around here.
Headwinds aren't so bad. I do OK in group rides, although people don't trust me enough to yet to draft me (I'm really quite safe but bents are not common in our neighborhood).
You use somewhat different muscles. My inner glutes, hamstrings and calves get more use than I did on the DF.
If you want quick acceleration and speed to burn, you might have to plunk down $3900 for a Carbon aero 2.0, and get some Zipp wheels for it. Folks who do that can go pretty fast.
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Momento mori, amor fati.