Why is Blockchain so slow?

[minhdang2212]

If it costs more then it will lose its competitive advantage with other forms of remittance such as bank, paypal, ...

The advantage is still there which there will be no 3rd parties involved for each individuals transaction.

Every bitcoin deal we have to deal with the miners. Are the miners here considered 3rd parties?

[MintDice]

Luckily, Lightning Network is in beta testing to figure out how to help with some of these issues; It will allow more technological capability within the blockchain. We go into more detail about this on our blog post, so check it out 

Bit.ly/LightningNetwork101

Hope this helps!