Increasing the rate of modeline display

[Artur Malabarba <bruce.connor.am@gmail.com>]

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Is there a way to (temporarily) increase the rate at which the mode line is
redisplayed?

I was trying to write a package that adds a spinner to the mode line (to
indicate ongoing operations), but I hit a wall because the mode line
sometimes takes many seconds to redisplay.
I started writing a solution with timers, but that seems like a lot of work
for something so simple.

Cheers

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