When loading an effect or an instrument, it often triggers a redraw of GUI elements (datastructure scalars, to be precise), which can take up to many seconds, depending on session size, the number of loaded instruments, respectively. It turns out netpd still works well without that redraw. Thus a patched version of Pd that disables those redraws has been used for the macOS and Windows packages for netpd.
Get them at the usual place or here:
macOS: https://www.netpd.org/software/netpd-current-macos.dmg
Windows: https://www.netpd.org/software/netpd-current-windows.zip
Have Fun!