Problem with :argdo and :vimgrep on latest Windows build

I'm using VIM 8.0.586 on Windows 10. Recently, I've experienced strange and unexpected behavior when using ":argdo" and ":vimgrep".

When I use either of these commands, the text being operated on or searched seems to "fly by" on the screen. This is almost as if VIM is playing out the operations for me as the text is scanned. This is certainly new behavior.

I checked and made sure that "lazyredraw" was set. What could be the issue?

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