MacOS X 10.10.3 Update is *TOXIC*
As a PSA (public service announcement), I'm reporting here that updating your Yosemite system to 10.10.3 is incredibly toxic if you use WiFi. I've seen other reports of this, and I've experienced it myself. What happened is that the update for 10.10.3 seems to have done something tragically bad to the WiFi drivers, such that it completely hammers the network to the point of making it unusable for everyone else on the network. I have late 2013 iMac 27", and after I updated, I found that other systems started badly badly misbehaving. I blamed my ISP, and the router, because I was seeing ping times of tens of seconds ! (No, not milliseconds, seconds!!! In one case I saw responses over 64 seconds.) This was on other systems that were not upgraded. Needless to say, that basically left the network unusable. (The behavior was cyclical -- I'd get a few tens of seconds where pings to 8.8.8.8 would be in the 20 msec range, and then it would start to jump up very