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There isn’t a “Definitive” size for Thumbnails
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If you use the Hub’s Scraper (which scrapes the http://www.themoviedb.org/ )
it downscales 1000x1500 posters to 185x278 approx 20-30 KB
(the old wdtv units … recommended size was 120x180)
Resolution / Filesize … are a factor in Image Quality / Navigation Speed
Which is fine if your are using the “Mochi Default Theme” (eg. grid view)
Custom “Themes” may require something higher …
eg. i use 300x450 @ under/around 70KB and Image quality and Navigation Speed is Acceptable to me.
other people recommend 200x300 (which is fine as well)
Experiment