It is normally the worst (least responsive and slowest) website I use routinely, but the last week or so has been even worse than normal.
It seems to vary by time of day, but often I will have to have multiple tabs open trying to get to the same destination while they spin and spin.
The mobile app is better, at least most responsive, but is limited in functionality (e.g. ability to cut and past, bounce back and forth between messages and calendars, etc).
Maybe there is some super awesome upgrade coming and they are just working through the magical transition that will make their site the best on the net 😉