A couple of days ago, I had a transaction take 1 hour to confirm! Never had that before, and have since increased the fee I pay in the hope of avoiding that in the future. I wonder if the network is becoming overloaded.
Frankly speaking this is normal. It no that network is becoming overloaded, because we have still huge capacity.
It is the amount of transaction with extremely low fee and dust transaction which can be a problem and somewhat choke blockchain.
Don't worry about it and wait for bitcoin upgrades on which developers work on right now - like SegWit and Lightning network...