I geared my warlock from 445 to 493 in 10 days. Yes i dinged lvl 90 on March 26, on April 6 i had ilvl enough to do first bosses in TOT.
this is how i did it:
-buy full set of 458 PVP + crafted 496 + DMC trinket @ 90
-get coins on isle
-run mv lfr, then hof/tes lfr
-kill sha & galleon
-do MV 3/6 heroic run (i had 6/6 hc achi on main from 5.1)
-do TES run first boss on elite
-do new raid finder
outcome:
-4 set T14 (extremely lucky 2x 496 tier from 1 Sha kill, 2 parts from raid finder)
-503 elite dagger and cloak
-496 galleon neck
-522 valor ring
-502 offhand and belt from new raid finder
-483 raid finder + 476 DMC trinkets
-483 raid finder ring in 2nd slot
-496 bracers for 7k gold
-476 sha quest boots
RNG helped a lot, it was super good. Redeemed my horrible RNG on main in 5.0, had wrathion quest rewards banked for 3.5 months because no weapons dropped. I used a blue weapon @ 502 average ilvl, with 9/16 heroic progress.