Decent is a network for publishing content and runs on the Graphene based software. Graphene has many advantages, such as very low blocktimes which result in nearly instantantious transfers and high TX throughput.
Graphene software is based on the DPOS model and not on the Proof-of-Work model. There is NO need for heavy computing power to calculate algorithms to find solutions and create new blocks and get rewarded.
It is not a environmental unfriendly game of 'who has the biggest CPU/GPU'.
Instead it is about having stability through active miners witnesses who run copies of the ./decentd software on their dedicated servers and make sure transactions on the network are pushed in blocks and verified and signed off and pushed into the chain.