Hi again Heiner, thanks for continuing to respond.
I plan to try a faster SD card and enable sd_overclock in /boot/config.txt and will let you know if it helps. Not sure when I’ll get the chance to try it though as other aspects of my life are taking up most of my time.
I’ll also try asking about LMS performance over at the Slim Devices forum, but to clarify once again; I never expected a search task to be split between cores, but I would think that search tasks and music streaming should be on separate cores. The worst aspect of the problem I’m seeing is when music playback stops for several seconds just because I „flung“ the song list in Squeezer.