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Only COD won't be possible anymore, you can still send items and gold to your own characters. COD was just used to make it cheaper since the mail fee was based on the item you put in it, not on the amount of gold you 'demanded' from yourself for it, which avoided one of their ways to control inflation.
The outfitter coupons don't, but you can send the swirly coupons to other characters via shared storage and then buy the outiftter coupons on the desired character.
Might try this: http://coderbag.com/programming-c/disable-cpu-core-parking-utility
From what you're saying it seems like your CPU thinks that it doesn't need to utilize all of its cores when it indeed does, which is why your game performance jumps when you pull up something more demanding. This is a feature of windows itself and is called CPU parking, so the 'parked' cores only get activated by windows when it thinks it's necessary, unparking them with the program only changes 2 registry entries telling windows not to park any cores.
Additionally, putting your PCs energy saving plan (or whatever the option is called in english) to high performance might also help.