I just analyzed an ugly Publisher bug with the help of the Facebook Publisher group. For books with about 70 to 130 pages with about 300 small music graphics (Affinity Designer, linked, not embedded, no one is bigger than 100 KB), I can start Affinity and open the file. After about 2 minutes, Publisher freezes for about 30 to 40 minutes (!!!), the apple beach ball occurs. After this time, normal working is possible. I checked the issue:
Create a new new, equal document >> same issue
Than remove all music graphics >> no problem
Insert hundreds of large jpg, eps and png graphics, some larger than 100 MB >> no problem
Placing the orignial music graphics >> hello problem...
I'm using the music font Opus and the workflow with music graphics is:
Create a music file with Sibelius
Export graphic as PDF
Opening PDF with Affinity Designer
Edit the file, save as Designer file
Import Designer file direct as link in Publisher
It really does NOT depend on my computer, RAM, GHz, SSD, file places etc. It's just the Publisher that is causing the problem.