Trader issues have two main reasons, first of all every item for sale on trader before merge does not show and has to be reupped, means stop sellling it and put it up again to make it show in search results!
second and most likey the main reason why trader is so slow, a huge amount of players sate their curiosity and search fo some on trader. those of you who were there from the start and in the first few months should remember this. server isnt idle anymore, its running close to its limits with so many ppl oinline on one server. trader is simply lagging a bit