I have the same issues. I think LG started a thread with similar issues too. I think it has to do with the various advertisements. it seems like any time there is a video ad it takes 5 minutes to load, and I wish that was hyperbole. this time I saw a script for "waiting for dt-secure.videohub.tv....." but I have seen several like that.
issue has been on multiple comps and browsers. doesn't seem to be an issue on mobile but maybe thats because the adds work different there?