For researching traits: Try and keep your research balanced, so instead of having 5 traits unlocked on chests, you have one each on chest, hands, feet, waist and legs. This is for two reasons. 1. As you research more traits per item, the time to research increases significantly. 2. In the world there are crafting stations that will allow you to create set pieces of armor. To do so, you need a certain number of traits unlocked.
For researching traits: Try and keep your research balanced, so instead of having 5 traits unlocked on chests, you have one each on chest, hands, feet, waist and legs. This is for two reasons. 1. As you research more traits per item, the time to research increases significantly. 2. In the world there are crafting stations that will allow you to create set pieces of armor. To do so, you need a certain number of traits unlocked.
Third reason: you get to 8 or 9 traits and can't use all your research slots because you only have traits on two items left.