Why are Bitcoin transactions so slow?

Related questions

1. How many confirmations does Bitcoin need?
2. What if my bitcoin transaction is not confirmed?
3. How do you cash out a Bitcoin?
4. Is Bitcoin still untraceable?
5. How long does it take to get 1 Bitcoin confirmation?
6. How bitcoin blocks are created?
7. What is TXID Bitcoin?
8. Is Bitcoin still making money 2019?
9. Is Bitcoin illegal in Australia?
10. How do I confirm Bitcoin on Blockchain?

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