Hi Heda,
I found what was causing the audio dropouts with 10+ analysed tracks:
it seems that it is the audio_statitics JS. Indeed, if they are activated I get dropout, but if they are not, I don't have dropouts. They don't create huge CPU increase on the performance meter but somehow having too many of them isn't good for audio.
A quick fix: having a button to not analyse RMS (and so, deactivating audio_statistics plugins which is used only for that purpose) should fix my performance issue. I don't use RMS meters, only Loundess.
I know you haven't updated Loudness Graph for a while but really, it is a great script.
Thanks !