Spy marker is lightweight alternative for google analytics. Tested by BrowserStack.
https://cdn.rawgit.com/co11ter/spy-marker/master/marker.js
new marker(options);
{
sizeForSend: 50, // data pack size
url: 'http://localhost/test?param=1', // url for send data
stepSkip: 10, // save step (for example every 10th will save)
timeout: 30 * 60 * 1000, // end script length (in mins)
iframe: true // send data by iframe
}