I around 9 seconds in f2l alone. I am decent at tracking piece , deduction, sometime using prediction; but in a solve, I often do not have enough information(During the process of solving one pair, I failed to find another pair). I have a decent feel how solving a 2gen pair affect the pieces in the slot. However, if nothing useful was in the slot, I would often pause. I watch many example solves from the pros, and they can easily spot one or two pairs. I do not look other unaffected slots when I solve a pair. I think I do not have time in a speedsolve, or it is just something I need to work on. Another problem I have is that if I see a corner at UBL, assuming I use the white cross, the white sticker is at LUB and the green sticker is at UBL, I do not know if the remaining sticker is orange or red. Do I need to do a u move to check it, or memorize in this case(if I cannot use deduction) the remaining color is orange. What should I do? Thanks to all of those who answer my questions.