I just noticed that since I use V4, my page loading time became very very long. By checking the performance during loading time I found out that was _initializeAudioContext that took 80% of the scripting which is huge!
I load only one audio file which weight only 1,5 MB and I didn’t have that issue before that is why I guess this is a bug with V4. Or maybe an update of the browser?
For now, I removed the sound of my application and the page loads normally and quick!