UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36

Steps to reproduce the problem:
1. Try to load chunked flac into MSE

const mediaSource = new MediaSource();
mediaSource.addEventListener('sourceopen', () => {
  const sourceBuffer = mediaSource.addSourceBuffer('audio/mpeg');

  const onAudioLoaded = (data, index) => {
    console.log('chunjreceived', index);
    this.buffered = this.buffered + 10.0;
    const gaplessMetadata = {
      audioDuration: 10.0,
      frontPaddingDuration: 0.025057
    };
    const buffered = sourceBuffer.buffered;
    const appendTime = index > 0 ? (buffered.length ? buffered.end(0) : 10) : 0;

    sourceBuffer.appendWindowEnd = appendTime + gaplessMetadata.audioDuration - 0.02;
    sourceBuffer.appendWindowStart = appendTime;
    sourceBuffer.timestampOffset = appendTime - gaplessMetadata.frontPaddingDuration;

    if (index === 0) {
      sourceBuffer.addEventListener('updateend', () => {
        console.log('updateend');
        if (++index < this.props.source.chunks) {
          console.log('addchunk', index);
          this.getChunk(index).then(function(data) { onAudioLoaded(data, index); } );
        } else {
          // We've loaded all available segments, so tell MediaSource there are no
          // more buffers which will be appended.
          mediaSource.endOfStream();
          URL.revokeObjectURL(this.audio.src);
        }
      });
    }

    sourceBuffer.appendBuffer(data);
  }

  this.getChunk(0).then(function(data) { onAudioLoaded(data, 0); } );

What is the expected behavior?
Load quickly each flac and then make audio playable

What went wrong?
When trying to create the MediaSource, the resources get fetched at a lower rate than with mp3, tab uses 50% of CPU (4 cores in a VM) and memory increases relatively quickly (I got 500MB for the tab, 170MB before). Audio never plays (or I never got there ^)

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 57.0.2987.98  Channel: stable
OS Version: ArchLinux
Flash Version: 

The audio is just a flac file splitted in 10s chunks.