I have a folder with 46.6MB across 25 messages. I can move those messages from folder to folder "instantaneously." The MUA is Apple Mail. In the past moving folders with more messages (but smaller total size) has not been an issue.
One minor point... Apple Mail hides latency from the user via extensive threading. If you bring up the Activity window, you can see what it's really doing in the background, and how long it takes.
~Kyle
--
The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.
-- Bertrand Russell
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