The thing that I hate most about bitcoin is Blocktime is way too high.
Sometimes Transactions take 2-3 hours even if they are high priority.
Sometimes the confirmation of the transaction take more than 2 hours, it causes so many transactions that happens in one time, perhaps. I also don't know how to solve that even add some fees.
There is no solving to that problem only the developers can solve that problem,the congestion in confirming transaction is getting bigger and bigger.