When loading obvious delays show

Although I have noticed this on other sites in the past - it seems particularly obvious on these new sites. Is there something that can be done?
Please advise.

http://im.gse.harvard.edu/
http://im.gse.harvard.edu/balancing-a...
http://im.gse.harvard.edu/todd-rakoff

https://www.screencast.com/t/I7B5T54zk this is a link to my screen.
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