I have a client that has a couple customers getting this issue with his WordPress site,

Stop running this script?
A script on this page is causing your web browser to run slowly. If it continues to run, your computer might become unresponsive.

I researched it online and came up with this:

The only way to solve the problem for all users that might be viewing your page is to break up the number of iterations your loop performs using timers, or refactor your code so that it doesn't need to process as many instructions.

I cannot locate where these iterations are, I located my slider.php but can't seem to figure out where they are at to break as this would be the only thing looping, correct?

any help would be awesome!

site is