how can i execute multiple instances of a function simultaneously, instead of sequentially?

Technically computers can't do anything simultaneously, unless it's quantum computing! Computers only mimic/simulate this, by switching and prioritizing processes very quickly. So, I'm not really sure it's possible, but I understand, at times I've wanted the same. It depends exactly what you want... perhaps there is a way I don't know of.

i have a function that generates then animates random strings of text. i would like to display multiple animated strings at the same time.

You don't need to use quantum computing to run to programs at once. Just use two computers at once.

Oops, it's "two", not "to".