User statistics module slows down the application

[lassoan]

User feedback (https://discourse.slicer.org/t/new-module-for-measuring-user-statistics/9220/5):
"One time, I did try enabling collection of user statistics, and a few minutes later, I was struck by how slow and unresponsive Slicer had become. After unchecking the UserStatistics “Enable” button and restarting Slicer, the application was responsive again, as usual. I did not do any further testing, but it was suspiciously correlated with my only attempt at enabling collection of user statistics."