By now many people would have noticed already that Hive Engine is down and the witnesses are trying to catch up. It is expected that it can take at least a day or two for a fully functional Hive Engine as we don't have any concrete solution yet. There are a few proposals on what can be done to handle this but most of them also have their own advantages and disadvantages.
There are so many projects that are dependent on Hive Engine right now and the code optimization is very important for Hive Engine considering the fact that it is struggling to process blocks one by one. Another problem faced by Hive Engine team is that even if someone is interested to build something, there is not enough revenue being generated to compensate further development. Sometimes issue fixing also becomes a challenging one.
Last night there was a heavy spamming happened where one specific account broadcasted hundreds of transactions trying to place some micro orders in the market. This caused a heavy delay in processing the hive blocks. The spam was done specifically by an account called 
There is a possibility that the spammer might get back to spamming after we are all caught up and the chain is back up again. So the only way to handle this would be to have the solution implemented so that in the future such things can be handled. The first solution would be to restrict the number of transactions per user which will be only 20. I guess I myself might have to update some of my bots if at all this change happens. The next change might be to add a number of market orders that caan be placed in the market. 250 open orders per user will be a decent value I believe.
Now we have to be patient until the issue gets resolved and the block processing gets back to normal. It is also advisable to no do any heavy activities on Hive for Hive Engine.
If you like what I'm doing on Hive, you can vote me as a witness with the links below.
@balaz as a Hive Witness 
@kanibot as a Hive Engine Witness|
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