Right Library read of 50049 tracks took 17 minutes so not bad as you only really do this for the first run . I have now fully loaded the Rpi 4 and set it going as my LMS server . Music started straight away and is playing as I am typing this. Response and reaction to requests is very quick and much smoother than before .
So far working very well and all the normal additions I use with LMS (Material Skin , Radio Paradise , BBC iPlayer ) all seem to be working well . I only use this Pi as a server so no hat or sound card loaded so not able to say how that function is working . So far so in my view very good . I hesitate to add this as it is a very subjective thing but I feel the sound quality has also improved and seems more solid and stable than before .