When applying email message filters, it should be multithreaded with configurable number of threads for lower elapsed time of applying filters, especially when running on entire folder.
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Everything should be multithreaded. I have six different email account, some personal, some for work. The work email can get an average of 30000+ emails a day, and waiting on getting mail takes forever. Even clicking for a new message is tearfully slow. Seriously, the program will freeze when processing one account/folder at a time for retrieval and filters.
Computers, even so-called cheap ones have at least 4 or more cores now days. The time of single tasking Windows 3 are over.