Montrell Washington, KJ Hamler and Jalen Virgil are all fast.
Since none of them ran the 40 at the combine we can’t talk about their actual 40 times, but we can talk about how they were clocked at 4.3ish at various other times during their careers. In a straight line, without pads or helmets, they are all among the fastest people on the planet. The catch is that for many wide receivers, straight-line speed does not equal success. I did a study back in 2014 looking at speed score and why it doesn’t correlate with NFL success for WRs.