I see what you mean. I could only submit my post on my fifth try. And the site took some time to respond between every attempt.

I'm no expert, but I think the steem blockchain is fine. It is perfectly accessible through other platforms, like busy.org. I used it to check other posts and comment, because it was difficult to do it here on steemit.

As others have already noted, I can only assume this is a problem with the steemit website on the server-side. Probably the same problem we had days ago with the DDoS attack. But only the developers or someone related can confirm.

I believe they're aware of this and are trying to solve it. But I also understand the frustration it might cause.

All the best