See the problem and it might be a chrome bug.
You could try if adding the following to the page head code fixes it:
Code:
<script>$(function(){setTimeout(function(){if(xr_chrome)$(".parallax,.parallax2").css("will-change","transform");},1000);});</script>
Found a hint for that at stackoverflow but didn't fully test it. Just tried if directly adding the css in the developer console in chrome helped, and it did. But adding the same to firefox caused another problem, so adding some code seems the quickest solution.
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