for sub 15:
you need to be able to solve most of your F2L pairs in 8 moves or less, together with the back slot cases. You also should know full OLL and PLL. Cross also needs to be 8 moves or less. You should also be able to plan full cross in inspection. Lookahead should also be decent (like no pauses for one pair with like 5TPS)
for sub-10:
you should be able to plan cross+1 (or just know where your next F2L pieces are and not exactly the case), your turnspeed should also be around 5-7 TPS, your lookahead should be good (like no pauses for 2 pairs), and you should be able to execute most of your LL algs in less than one second and recognize them within about 0.3 seconds