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Extremely slow re-filtering when

I've relatively large inbox (ca. 75000 messages, IMAP), and I want to re-filter it with some quite simple filter ("Recipient contains") with action "Set color group".

To my surprise, this operation is extremely slow - I left it overnight (well, circa 8 hours) and it has filtered only ca. 50000 messages.

But, when action is "Set tag to...", it is very, very quick - hundredths of messages per second.

What could be the reason for this?

Thank you!

PS: I use most recent The Bat! v6.6
I use latest ver. 8.4x and I have similar issues.  Is this a server response issue outside The Bat!'s control?
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