I have found that pages with a lot of actions take a lot longer to load up... I have also switched even most of my audio to streaming, that seems to be a big help. Try publishing a very basic title and see how it runs. Make sure that this isn't a bigger issue than just Lectora. I have seen things like this happen a lot on LMS's that have been running for years. If you have good transcript tracking, even on retired users, the database only gets larger, not smaller... When you take a course that is changing variables and stuff, the database usualy gets hit.Just something to look out for...
