Why are my green bars so low in Minecraft?

When I press the tab button on a Minecraft server, the green bars are really low. They used to be full all the time but aren't now.
Why is that? What have I done wrong?
Best Answer
The green bars represent how good your connection to the server is.
They are likely lower than they used to be because your connection to the server has gotten worse. If you haven't changed your connection then it's likely just a temporary fluctuation; you may see them go back up to full if you connect at a different time.
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What do the green bars mean in Minecraft?
See if you have a bad connection by looking at your ping from the Bars shown on server list/tab in-game, 1-2 bars means you have poor connection to the Minecraft server but you will start noticing issues from 3 bars, 4-5 bars should play fine.Why do I have 2 bars in Minecraft?
Fixes to try:Minecraft graphics issue - how to fix white lines between blocks
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Answer 2
The green bars show whether you have a good or bad connection to the server (ie. a good or bad ping).
It can be effected by your internet connection (I get this when I'm using the coffee shop wifi, for example), or a bad connection somewhere between you and the server. When your computer connects to a web page or a server or anything online, it hops through a bunch of connection points along the way. So, if there's a problem between you and them somewhere in the middle, that could do it too.
There's a way to check where the connection is slow, if you open a command prompt in Windows and type "tracert " and then your server name or ip (so, type: "tracert 192.186.2.3" for example, if that was the ip of your server), it'll show how long it takes to connect to each hop along the way. If you're really having problems, you could probably email a screen shot of that to your ISP and they might be able to help you troubleshoot the connection issue.
Answer 3
It doesn't really matter about what kind of internet you have though, and it usually also depends on the current processes. For example, I'm uploading some files, and I guess you can then expect the bars to drop.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: 李昂軒, Quang Nguyen Vinh, Stephen Paris, Felix Mittermeier