Following this rant : https://devrant.com/rants/1276494/...

So my coworker has a displaying issue, and the support ticket took time to give answers that does not work. (To tell you, the answer started with "I think that..." You tried what you said or you just think?)

So we tried everything they proposed (initialize the lists used properly, reduces the amount of data, etc.), nothing works. Then I added my two-cents and tried something.

I deleted a CSS class on a div.

Voilà. Issue resolved, it works perfectly. Nice.