ETH network has not enough complete nodes and look the result : less transaction and already stuck.
Complete nodes are a base for all P2P network.
You can not mine with not enough complete nodes to receive (and FILTERED WITH THE NETWORK RULES) all transactions around the network.
And specially in restricted area ...
Nodes
Developpers
Merchands (Users)
Exchanges
Miners
This 5 groups are the essence of the Bitcoin stability (in TASK view) : https://www.youtube.com/watch?v=rpeceXY1QBM