1) First of all, a reboot didn't help, the document still freezes (in 1.8.2) (was the same before with 1.8.3 and 1.8.4).
2) I created a new small test document (three pages with text and two photos) and didn't have a problem with it (in 1.8.2).
3) I then reopened the original document and it worked OKish, still some spinning beachball, but not as much as before (in 1.8.2).
4) I have since reopened the original document and it seems to be working just fine now ... no freezing (in 1.8.2).
5) I wonder if going through the same steps (creating/opening a new simple document, then trying the original document again) would work with 1.8.4?
Before I updated to 1.8.4 I didn't have a problem with anything.
It is pretty frustrating having these issues with Affinity. I am a long time Quark user (sometime InDesign user) and was thrilled to find Affinity.
Jim