When the focus between tracks changes the gui lags for seconds.
seems to be the creation of widgets for each control port in the plugin inspector
I made it a little bit faster..... but this probably needs some caching mechanism, won't do that yet. also this only happens on plugins that have thousands of controls like surge
also first thing to try: port those expander widgets from GtkBox to GtkListView
list view fixed the issue but the UX is a bit weird. track change between 2 vitalium tracks happens instantly now, before it was ~1 sec