Avoid expensive calls when rendering item show view page #5519
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Resolves #5509
I think the changes to these two files are all of the low hanging fruit that I could find. It's still slow but much improved since we aren't trying to fetch the MasterFile objects from solr 4 or 5 times.
With https://avalon-dev.dlib.indiana.edu/media_objects/3f462541v
Before: 9.9s (page) + 6.6s (manifest) = 16.5s total
After: 1.9s (page) + 5.2s (manifest) = 7.1s total