Mavericks Random Spinning Beach Ball appears for less than a second and then goes away Ever since upgrading to Mavericks v 10.9.0, the swirly beach ball of death shows up randomly for a split second, even if nothing is currently loading. 

Is anyone else experiencing this problem or is it a known bug?
Yes, I have seen this on two different machines. Its definitely a bug.

You can see a mention of it in lots of places, including here:

http://www.imore.com/round-table-review-os-x-mavericks