Use the alternate solver (in Settings/Spice). The sim runs nearly instant with this, and very slow with the "normal" solver.
I always set it to "alternate" btw. So I didn't notice this was slow, and had to fiddle with options to figure out why.
As moffy pointed out, the real "culprit" here is using generic diodes, which model ideal diodes (that will make very severe non-linearities that are hard on the solver). So even if using the alternate solver makes the sim very fast, I'd still recommend assigning "real" diode models. Otherwise, your sim won't be realistic anyway.