UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36

Steps to reproduce the problem:

1. Setup an OfflineAudioContext and schedule a sample-based song to be played.
2. Use context.startRendering()
3. It is slower than I expected

What is the expected behavior?
A faster rendering

What went wrong?
I tried to export many audio graphes, but I will give you an example :

With a 60 seconds, sample-based audio graph, scheduling ~800 AudioBufferSourceNode (from 0.25s to 1s in duration) with only little sound processing (amplitude envelope).

It took about 50-60 seconds to export, where I expected it would take  < 10 seconds.

I tried with Firefox and it seems that their implementation is much more efficient as it takes around 15 seconds to export the same buffer.

I'm wondering if you already know about this relative slowness and if anybody started working on an improvement? Or maybe do you know some tricks/hacks to make the whole process faster?

Thanks for you help

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 60.0.3112.90  Channel: stable
OS Version: 10.0
Flash Version: 

I feel like it isn't the case but let me know if a snippet is required