To record in mono, set recording channels to "1 (mono)" on the Devices tab in Audacity. You can position it in the stereo mix later. A single instrument or solo vocal track should usually be recorded in mono. Stereo requires your machine to handle twice as much data.
Don't record stereo unless you have to. Higher rates will significantly increase the data load without proportionately improving the quality. Set the Project Rate to 44100 Hz at bottom left of the Audacity window or in Quality Preferences as above. Reducing the bit depth halves the amount of data processed and the time taken to write it to the disk. This can be done at "Default Sample Format" on the Quality Preferences. Consider reducing the bit depth for recording and importing from the default 32-bit to 16-bit. 
Consider installing more RAM, RAM is relatively inexpensive and extremely cost-effective in improving computer performance. Recordings will stop if the paging file is full. Set system swap or paging file appropriately. Try to avoid data transfers between networked computers while recording is taking place. The path can be set in the Directories Preferences. Audacity's temporary directory is used for storing audio data whilst recording and needs fast access. Set the path to the Audacity temporary directory to a local drive, not a network or USB drive. Instead, schedule updates to run overnight or at other times when you know you won't want to record. Otherwise, consider disconnecting from the internet then disabling your firewall while recording - some common firewalls can consume 30% or more of a slower computer's processor usage.Īvoid scheduling security updates such as Windows Update during recordings, or allowing the computer to choose its own random times to update. See if the scanner can be configured to ignore files written in Audacity's temporary directory (see point 3 below). This scanning can affect recording as it takes too long. By default, Norton, Sophos and other anti-virus products scan each Audacity. Be aware of background virus scanners and other system tray programs. 
Close all un-necessary programs and processes while recording. Ensuring sufficient computer resources are available
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