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It is the amount of digital space that you use to post and comment. If the bandwith is zero you have to wait before you can add anything on Steemit. There is a website I use to see how much bandwith and votepower i have. It is for you https://steemd.com/@jxm . As you can see you can find yourself to use your steem name after the /. I am a newbie myself so if anybody else can explain better please leave a comment

wow. Many thanks. That's great. Full record!

Thanks @barbaarseevelien, yes you are very correct. I use steemd to see my bandwith. When it's at zero no comments or posts are allowed. Last night when I went to bed I was at 98% bandwidth. When I work in the morning and tried to comment - it won't let me. I went to steemd and saw my bandwidth was -32! I'm just wondering what made me lose juice.

I am wondering that to and I wish I had an answer for you. The only thing I can think of with my newbie head is how slow this site is if I try to load it, Perhaps you have seen old information before going to bed? As an solution I look for the amounts of post and see if thats the same on both sites. I hope you get an real answer instead of my guess.