Growth stocks can be volatile. Sometimes, they're beloved market darlings, with stock prices soaring on the wings of speculation and exciting business prospects. Just a few months later (or earlier), the same companies may be found in the proverbial bargain bin as investors seek stability and proven profits in times of crisis. This corner of the stock market isn't for the faint of heart.

But the same volatility that might make me reach for the antacids can only set the stage for incredible long-term gains. When the stock of a great high-growth company is on fire sale, it's time to buy.

On that note, let's check out a duo of formerly high-flying stock market sweethearts that have been swooning recently. One stock is almost back to its former highs, while the other stands a hair-raising 88% lower in three years. I'm talking about (NASDAQ: NFLX) and Roku (NASDAQ: ROKU), the service and platform masters of the media-streaming universe.

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Source Fool.com