I have to admit, I'm not that up on on reading the output of process monitor, but I had a look as suggested.
Here are a few images
I did see a lot of buffer overflows when covers were queried
For books, there were entries 6times for each one.
And also noticed when opening a reg key, it kept trying but, not found?
Anyway in last image is my plugin list, wondering if I have smiler ones as you lugopt?
I do use several custom columns.
If I'm understanding the latest posts - some extra calls could be due to whats showing in the gui when the program is closed, requiring that info to be read when opening up the gui again. If this is done after a reboot then the info wont be cached...I'll have a play with that.
If any of that info helps, or you want me to try anything let me know.
ps - some plugins are for research use only obviously