According to the equation you mentioned (Speed = wavelength x frequency), if the wavelength of a wave remains the same while the speed of the wave increases, then the frequency of the wave must also increase.
Now, the energy of a wave is directly proportional to its frequency. In other words, as the frequency of a wave increases, so does its energy. This relationship is defined by the equation E = h x f, where E represents the energy of the wave, h is Planck's constant, and f is the frequency of the wave.
Since the speed of the wave has increased while the wavelength remains the same, the frequency of the wave must increase as well. Consequently, according to the energy-frequency relationship, the energy of the wave will increase. This means that if the speed of the wave increases while keeping the wavelength constant, the energy of the wave will also increase.