If you use Calibre for your ebooks but haven't gotten the 5.2 update from a few days ago, I'll note that while I can't give specific data (not having kept a record of exactly how long it takes) but updating my list of nearly 1500 fanfics hosted on various sites just now took about 20% less time than in v4 - a difference of literal hours in this case. My internet speed hasn't changed and is hardly the deciding factor in retrieving sub-megabyte text files anyway, but the little blips in the status bars as it asks for something and gets a reply were coming much closer together than I remember, so I'd guess there must have been some serious revisions in code efficiency for the processing and turnaround of jobs.
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‎noli esse culus
‎noli esse culus