Because of the demand of transactions - Visa and MasterCard process around 7000 transactions every second and this has been the issue with crypto because there is limited space on the blockchain technology and people do not know when and where they r on the blockchain so there Is limited space. Because of this - there are Slow transactions and High fees - due to the demand to get into the network. 

If we want crypts to be adopted as mainstream decentralized market then we need to have at least thousands / tens of thousands to compete with visa or MasterCard 


TRANSACTIONS per SECOND -
BTC - 7
DASH - 10
LTC - 50
XRP - 1500
XRB - 7000