Caching data delay
When you mark watched on a video, it directly goes into caching your data, what if this had a 5sn delay and then it would be cached which would enable the marking watched on multiple episodes much more quickly? I don't know if this is the case but maybe an idea?
Please see my first comment, I think a 5d delay would actually cause less caching to occur.
AdminJustin (Founder, Trakt) commented
If a 5s delay was added, the issue would be most people would just navigate away from the page before it even started re-caching.