My theory is that they have little incentive to improve performance. All of your professional network is there, and it's not like there's another website with n

My theory is that they have little incentive to improve performance. All of your professional network is there, and it's not like there's another website with nearly as many people on it for that purpose. So you will use it no matter how crappy the performance may be, because that won't negatively affect their revenue nearly as much as an e-commerce website.