Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  ms/call  ms/call  name    
 27.02      0.77     0.77     3280     0.23     0.24  EngineFilterIIR::process(float const*, float const*, int)
  5.96      0.94     0.17     1669     0.10     0.14  SoundSourceMp3::read(unsigned long, short const*)
  4.91      1.08     0.14      989     0.14     0.14  BpmDetect::updateXCorr(int)
  4.56      1.21     0.13      687     0.19     0.19  EngineBufferScaleLinear::scale(double, int, float*, int)
  4.56      1.34     0.13        2    65.00    80.00  timecoder_build_lookup
  4.21      1.46     0.12                             BpmDetector::run()
  3.68      1.57     0.11  1354425     0.00     0.00  q_atomic_decrement(int volatile*)
  3.51      1.67     0.10      227     0.44     0.97  ImgColorProcessor::getImage(QString)
  2.81      1.75     0.08     1618     0.05     0.05  EngineVuMeter::process(float const*, float const*, int)
  2.81      1.83     0.08      554     0.14     2.84  SoundDevicePortAudio::callbackProcess(unsigned long, float*, short*, int)
  2.46      1.90     0.07  8918986     0.00     0.00  SoundSourceMp3::madScale(int)
  2.46      1.97     0.07     2231     0.03     0.03  VisualBufferMarks::draw(float*, int, float)
  2.46      2.04     0.07      200     0.35     0.35  VisualBufferSignal::update(int, int, long, int)
  1.75      2.09     0.05  4945268     0.00     0.00  QColor::QColor(QColor const&)
  1.75      2.14     0.05  1412784     0.00     0.00  ImgAdd::doColorCorrection(QColor)
  1.40      2.18     0.04  1769026     0.00     0.00  QList<_AudioSource>::constEnd() const
  1.40      2.22     0.04  1002806     0.00     0.00  q_atomic_increment(int volatile*)
  1.40      2.26     0.04     2163     0.02     0.02  EngineClipping::process(float const*, float const*, int)
  1.40      2.30     0.04      554     0.07     2.08  EngineMaster::process(float const*, float const*, int)
  1.05      2.33     0.03  3538043     0.00     0.00  QList<_AudioSource>::const_iterator::const_iterator(QList<_AudioSource>::Node*)
  1.05      2.36     0.03   886402     0.00     0.00  q_atomic_set_ptr(void volatile*, void*)
  1.05      2.39     0.03   884507     0.00     0.00  QList<_AudioSource>::const_iterator::operator++(int)
  1.05      2.42     0.03   884506     0.00     0.00  QList<_AudioSource>::constBegin() const
  1.05      2.45     0.03   712000     0.00     0.00  lfsr
  1.05      2.48     0.03     1102     0.03     0.03  EngineVinylSoundEmu::process(float const*, float const*, int)
  1.05      2.51     0.03      408     0.07     0.07  EngineBuffer::rampOut(float const*, int)
  0.70      2.53     0.02  1769032     0.00     0.00  QList<_AudioSource>::const_iterator::operator!=(QList<_AudioSource>::const_iterator const&) 
const
  0.70      2.55     0.02   885059     0.00     0.00  QList<_AudioSource>::QList(QList<_AudioSource> const&)
  0.70      2.57     0.02   417544     0.00     0.00  QListData::at(int) const
  0.70      2.59     0.02    82804     0.00     0.00  zap_denormal(double)
  0.70      2.61     0.02     1005     0.02     0.16  BpmDetect::inputSamples(float*, int)
  0.70      2.63     0.02       24     0.83     0.83  QList<AudioReceiver>::empty() const
  0.70      2.65     0.02        2    10.00    10.00  ReaderExtractWave::ReaderExtractWave(Reader*, EngineBuffer*)
  0.70      2.67     0.02                             VisualObject::~VisualObject()
  0.70      2.69     0.02                             MixxxView::MixxxView(QWidget*, ConfigObject<ConfigValueKbd>*, bool, QString, ConfigObject<