I assume you mean in your browser when you go to certain websites. This is normally code on the website itself that is either poorly written or not written for your particular browser or perhaps the code was intercepted by add-ins you may have running to block pictures or ads etc. You can try a different browser or in-private browsing which might help otherwise you might have to live with it or avoid those websites.
NOTE: You can usually change the time allowed for scripts (set it shorter) so that at least you aren't waiting as long; how to do that is browser dependent.
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