Can they be highlighted in a different color please? Maybe red for the first time you see it but after that do we need something huge and red over and over? Red seems like something's horribly the matter. Performance issues are a big deal but the red is extremely jarring and I think because nothing else is really highlighted like that any highlight color would be pretty effective.
edit: I saw a staff reply saying there'd probably be an option in the future to toggle them off. That's awesome and would be super helpful, yay! :) but I think it'd be neat to change the color too. I can see the warnings being helpful, even after you've read them the first time. For me, I often play for hours at a time and even though I know I should refresh I do it way too infrequently and the warning would be a good nudge to do it.