Investigate performance of CMService_KissMetrics_TrackEventJob

@fauvel @dlondero 
It's quite slow:
![screen shot 2014-07-03 at 15 43 04](https://cloud.githubusercontent.com/assets/360800/3470201/fe44ba12-02b7-11e4-83fb-53c9be2f2cfc.png)

Is this the network request(s)? Or something else?
Why the increase in time?