Looks like you are running with feature caching turned on. Suggest you turn it off-then we won’t do the unneeded work. You can have your cake and eat it too with a bit of a workaround: check out https://www.safe.com/blog/2018/05/caching-data-fme-evangelist174/ and https://community.safe.com/s/article/feature-caching-and-performance
Hint: collapsed bookmarks may be in your future.
Note that we are looking at ways of solving this issue in a more discoverable fashion. Sorry about the workaround for now.
All the best.