An SSD did help me quite a bit, I can actually play the content now. Before it would take me too long to load into zones. I can also see mobs now and they rarely disappear. If they do disappear I can move around a bit and it will show up. With my old WD HDD, B-ranks would even disappear at off peak times...and not reappear at all. So while it is still a server side issue, an SSD will help you if you have that problem. The higher the read speed of the SSD, the better.