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Mumble has high CPU usage

The two most CPU intensive tasks Mumble performs are resampling and echo cancellation. The first of the two, resampling, is entirely avoidable on most audio hardware in existence today. Mumble operates on a native 48Khz sampling rate and if your audio device is configured to take/provide exactly that sample rate no resampling needs to be performed by Mumble. You can change the native sample rate of your audio devices in your operating systems audio device configuration.

Echo cancellation is used to prevent feedback from speakers or poorly shielded headsets into your microphone. If you do not use speakers you can usually disable echo cancellation without any quality penalty. You can do so via the Mumble audio wizard or the Settings menu.

Note: Mumble can also have a performance impact on games it displays its overlay in. This will not show up as CPU usage for Mumble but for the game it is displaying the overlay in. If you notice an unreasonable performance drop in a game you can either disable the overlay completely or blacklist that particular game in the Settings menu to solve the problem.