Slow? How on earth can someone call Bitcoin's growth word small? Look at the past of money, look at the past of silver, gold, look at for how many centuries they have been used and how much time was necessary to adopt them and now compare them to Bitcoin. Btc was created just a few years ago and it almost conquered the world, its market cap is one of the highest in the world, standing next to the biggest businesses.

Bitcoin's market capitalization is $1.87 trillion, while gold's market capitalization is $22.5 trillion. ​Gold needed centuries, thousands of years to stand where it stands right now and Bitcoin managed to get 1/10 of gold's market cap in 15 years. And don't forget, Bitcoin is also used for payments while gold is mostly a store of value.