That is very unfortunate. Sadly you're not the only one experiencing those difficulties. This new platform may change alot of video experience for most. There is however the New DTube which is coming soon, with it you will have zero to no upload or playback hangings. You can check it out here :)
https://new.d.tube/
ALSO, the 3Speak Channel is not yet open to the public, it is in Alpha testing with only afew creators having access. But I believe if you login later you should be able to like, comment,subscribe and upvote though not post. Best part, you can do so with your Google and Twitter Account!
There's so much happening on Steem which is kind of very exciting. Slow but Steady :)) Thanks for your lovely comment xoxo