Today I got FZ Rush lube and put it in a lot of my cubes. Some of my cubes (MGC 2x2 and 5x5, shengshou (?) mirror cube, valk mini) are still roughly the same speed, while a bunch if my other cubes (mgc 4x4, thunderclap v3, xman bell v1 pyra, little magic squan, qiheng s megaminx, yufu v2 7x7)...