IMO, i think we should change this format a bit.
Make it Green if it makes a HUGE difference
Yellow if it makes a slight difference
White if it makes no difference
Red if it makes it worst.
And whatever's not listed, keep it grey.
In other words, i suggest the Yellow for slight, cause alot of games are getting green when in reality, they arent a BIG difference at all.
For example, Dark Sector id give it a Yellow.

i personal think this format would be better, that way people know with the little hard drive space they have if its gonna only help a little or a lot!
Thanks.
PS For example, anyone who listed a game that only loads a few seconds faster, i think should be in Yellow instead.