On Cryptotab, you buy hash power to mine, on StormGain you are not actually spending money to improve mining speed. You fund your account for trading, your speed increases for trading through funds, you are not buying hash power just like cryptotab.
Yeah, that's very correct but it's something similar. Even though you're not paying for hash power on StormGain like you do on CryptoTab browser, but the end point of making both payments that it's going to increase speed of your mining.