Well, that is the eternal question. To really make your inventory faster you should do like this:
one third is to delete (all that ugly clothing you will never ever wear again or all the baby stuff if you feel you are grown up now)
one third is to box (stuff you may just need a day after you deleted it, but you didn't use in te last 3 month, put it in a box and give it a really(!!!) speaking name)
one third is to keep (all the things you like, maybe reduced at bit, because you can delete the LM to you fav shop or the notecards with always the same explanations, put in in a file system with numbers like 01_Shoes, 02_Casual Dressing, 03_Lingerie or whatever fits the stuff you have)
So you will get the time back by less searching you used to sort your inventory.