Assalamualaikum，

Dear brother i think you need to give some more details in each question to get more rewards and votes from Curators.

The current blockchain systems can only handle a limited number of transactions per second, which may not be sufficient for large-scale applications.

Scability is a major concern, the Congestion of Blockchain and limitations in number of transactions is a major concern which cause the user to pay high gas fees.

Brother, I think it is better to explain more about each topic because your explanation is not enough for a new comer who come on you post to seek information.

Good luck and I hope you will understand and pay attention to my advises.

Your Well Wisher,
@cryptobitcoins