Just for the record, Wallace had a 4.28 40 yard dash combine time.
According to Wikipedia, Wallace's 40-time was 4.33s. For comparison's sake, The Ginn Family purportedly ran a 4.28 (but he didn't participate in combine workouts, so...).
I was able to dig up this nugget from 2008:
Following are the best 40 times and results in other events recorded by NFLDraftScout.com since 1999.
40-Yard Dash Times
4.24 - Rondel Melendez, (WR), Eastern Kentucky - 1999
4.28 - Jerome Mathis, (WR), Hampton - 2005
4.28 - *Champ Bailey, (CB), Georgia - 1999
4.29 - Stanford Routt, (CB), Houston - 2005
4.29 - Jay Hinton, (RB), Morgan State - 1999
4.29 - *Fabian Washington, (CB), Nebraska - 2005
4.30 - Yamon Figurs (WR), Kansas State - 2007
4.30 - Darrent Williams, (CB), Oklahoma State - 2005
4.31 - *Johnathan Joseph, (CB), South Carolina - 2006
4.31 - Aaron Lockett, (WR), Kansas State - 2002
4.31 - Santana Moss, (WR), Miami - 2001
4.32 - *Troy Williamson, (WR), South Carolina - 2005
4.32 - *Chad Jackson, (WR), Florida - 2006
4.32 - Jason Hill (WR), Washington State - 2007
4.32 - Tim Jennings, (CB), Georgia - 2006
4.32 - Chris McKenzie, (CB), Arizona State - 2005
4.32 - Tim Carter, (WR), Auburn - 2002
4.32 - Kevin Garrett, (CB), Southern Methodist - 2003
4.32 - Antwan Harris, (CB), Virginia - 2000
4.33 - Carlos Francis, (WR), Texas Tech - 2004
4.33 - Karsten Bailey, (WR), Auburn - 1999
4.33 - Chris Chambers, (WR), Wisconsin - 2001
4.34 - *Ahmad Carroll, (CB), Arkansas - 2004
4.34 - Domonique Foxworth, (CB), Maryland - 2005
4.34 - Tyrone Calico, (WR), Middle Tennessee State - 2003
So yeah, 4.33s is still damn fast.