CSS animated indefinite progress bar

Hi all!

I’ve been using indefinite progress bars <f7-progressbar infinite color="multi"></f7-progressbar> within my app only to notice that they stop animation if there is some cpu bound activity within JS runtime. I’m processing a number of arrays so it takes a few seconds. In the contrast a preloader component <f7-preloader color="multi" /> does not stop its animation. To my understanding it would mean that the latter is CSS animated while the former depends on JS.
So the question is if this is an intended behaviour or perhaps something wrong with my app? If intended then does there exist a version of CSS animated indefinite f7-preloader?