The Nasdaq 100 Technology Sector Index has gained more than 20% so far in 2021 despite a volatile start to the year, but not all tech stocks have enjoyed similar good fortunes on the stock market. Corsair Gaming (NASDAQ:CRSR) is one such stock that has struggled in 2021 despite turning in impressive financial growth.However, Corsair's weak stock market performance is an opportunity for investors looking to buy a high-growth company at an attractive valuation. It operates in a fast-growing market that has years of terrific growth ahead, and Corsair is well placed to take advantage of the opportunities at its disposal.Let's look at the reasons buying Corsair Gaming is a no-brainer.Investors shouldn't panic over Corsair Gaming's short-term headwindsCorsair Gaming's plunge seems a tad surprisi