I notice after a patch, the 1st time load takes longer then normal times. I guess ESO is doing final steps of the install. Let it work on it for a while... Assuming that u have a slower computer. Is it a fresh install?
I haven't played in maybe 6 months, just had a huge patch but that was yesterday. Also lagging like crazy. I have a very high end gaming pc 6 core processor 16 gb ddr3 and an evga GeForce gtx 760. I had 0 lag issues in the past but it's bad now once I do get in