Although I cannot predict the future with certainty, some cryptocurrencies are known for their high volatility, which can lead to rapid price increases (but also significant declines). These often include:

* Meme: Coins like Dogecoin (DOGE) and Shiba Inu (SHIB) have seen massive gains due to social media promotion and community interest. However, they are also prone to sudden and sharp drops.

* New altcoins with low market capitalization: These coins can achieve significant percentages with relatively low investment, but they also carry a high risk due to low liquidity and potential scams.

* Tokens associated with trending sectors: Cryptocurrencies linked to sectors like AI, Web3 gaming, or new decentralized finance (DeFi) innovations can see rapid price changes if their underlying technology or adoption gains swift attention.

Keep in mind that higher volatility means higher risk. Coins that rise quickly can also fall just as fast. It is essential to conduct thorough research, understand the associated risks, and never invest more than you can afford to lose.

Instead of focusing solely on "fastest" gains, you should consider cryptocurrencies with strong fundamentals and increasing adoption.