GD beginner here. I created a multi-paged document with InDesign. It's not too complicated, just some background images and text with headers. When sending as a PDF, the pages are loading one by one and slowly. Each line of text loads separately and the whole page will take 15 seconds or so to completely load. It's exported as the smallest file size. What else can I do? Thanks in advance.
If this is an issue with the PDF and not the computer. You can start by auditing space usage. That will tell you what is taking up the most of the space in your file.
Choose File > Save As Other > Optimized PDF. The PDF Optimizer dialog box opens.
Click the Audit Space Usage button at the top of the dialog box.
Adobe DC documentation https://helpx.adobe.com/acrobat/using/optimizing-pdfs-acrobat-pro.html
If you have very complex vectors in you PDF you will see a large amount of space dedicated to content streams. Which can increase the time and resources needed to renderer.