Do 2nd/3rd Grade SSJ slow you down?

[Super Neko Majin Z]

Do 2nd and 3rd grade SSJ (the forms Vegeta and Trunks used against Cell) actually slow you down, or do they just not increase your speed?

 

[Papasmurf]

3rd grade does, 2nd grade probably increases speed based on veggie vs ceru

 

[Diamond Ryan]

Trunks turned Grade 2 in order to chase after Semi Perfect Cell, so it most likely increases speed. Goku stated that Grade 3 'kills his speed' so it does decrease speed.