Were the block times always 5 minutes, or have they slowed down?
You are right, now is a little slow.
As far as I can see the average of the last 100 blocks is 231 seconds,
the moment when I'm writing.
In theory, internal specifications indicate a target time of 2 minutes,
and up to three days ago, the weekly average was around 132 seconds.
I have not dug very deeply, but the increase of the times is probably connected
with the fact that one of the users which usually is one of the largest staker of
this coin, has not generated blocks from about 2 days.
Normally, at other times it generated about 2000 blocks per week.
I think that it has transferred a large part of what he had in its wallet.
But this is just my conjecture.
PS:
Just to be clear, its address is still in the rich-list top-10.