I received some HTTP error 413 calls in the console log. After inspection why the event submission failed, I found out it was about the send in over 5MB of stuff while posting as little as 3 events.

In this case it was caused by the angular integration / feature reporting, based on ngRoute.
Path of the biggest chunks of data data are

data.@request.current.locals.$template

and also

data.@request.next.locals.$template

$template should probably not be included in the events, but I'm not sure if there are others. Best idea might be to pick the properties that should be included, instead of keeping an exclusion list?