I thing the fastest way of raising funds for your project is through your family members and friends, they are the once who believes in you and would want to see you succeed. If they fail you the next place is the bank.
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I would like to classify my answer based on small businesses and large businesses depending on the one of your choice. For a small business I think crowdfunding and going into a partnership might be the quickest way of raising funds. For large businesses opening a seed round or taking up business-specific loans might be the best way.
If you can get approval from the security board of your country, launching an IPO is the fastest way to raise business capital. In my home country, businesses manage to raise capital in millions just in a week or so through an IPO. However, the requirements for getting approval to launch an IPO are very tough.