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Sign language has a faster transmission speed than voice as it travels with the speed of light (299.792.458 m/s) while the voice travels at the speed of sound in air (343 m/s). Unfortunately, sign language cannot produce a lot of data per second (unless of course, you are Hatake Kakashi – はたけ カカシ) and so it cannot take advantage of its bandwidth. On the other hand, the voice can use a bigger part of its available bandwidth and can achieve a bigger overall throughput in most cases.