Old PCs: how to make a presentation quicker?

We need to run this on pcs we already own, which are not the latest machines. What should/can we do in designing presentations to make them quicker/smoother? Will reducing pictures resolution and number of colors help?
Also, we want to use some 3-D models we already possess. How do we do that without going through sketchfab? The dinosaurs we want to display cannot be artistic renderings but either 3-d scanned images of exhibits or created by a paleontologist to ensure accuracy (state requirement).
Please see the attached link to get access to my file.​

What are your PC specs?
Could you upload the project file onto a free cloud storage website like Dropbox, Google Drive, etc? I will then check at at my end.
What format of 3D models?
For better performance:


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