Your problem could also be caused from a fragmented/unhealthy drive. Your WaveLab default buffers should be suffiecient, but depends on your recording preferences, bit-depth/sample rate, audio card, computer setup, etc. Typically, smaller buffers are used in the studio environment for super low latency/monitoring. Larger buffers can be used when latency isn't an issue like in our application. The buffer is basically the size of the audio chunks being handled as they are processed.