From what we researched about this flickering effect on the Chrome browser issue, it seems like this is a common issue in the Chrome browser.

Even though I tested the following non-Easydiscuss pages, it does show the same flickering effect.

https://techjobterms.com/membership
https://techjobterms.com/tech-jobs
https://techjobterms.com/topic-groups?layout=list

I believe the issue is not related to your site template since it works fine in the Firefox browser.

Update here with JavaScript code that I added to the Custom Code Script section in the Yootheme template that solves the flicker on Chrome, Edge and Safari IOS and does not create new flicker on FireFox.

I got the inspiration from this site that addresses the pure Chrome flicker piece: https://monc.se/kitchen/152/avoiding-flickering-in-jquery/

This site provided the core of the "what is the browser here?" code, which I modified to combine it with the MONC script:
https://developer.mozilla.org/en-US/docs/Web/API/Window/navigator

I focus my script on the core browsers that need to get the "stop the flicker" code, such as Edge also.

I had also noticed flicker on Safari on IOS, so added that also to the script. For any browsers not listed here, the original script has the clues on how to add those.

Best I can tell, the issue is now effectively solved and all seems to work as expected without flicker!

Wanted to share and hope others can use this also.

Here is the script itself:

// put this in here to avoid flicker in browsers like Chrome //

var sBrowser, sUsrAg = navigator.userAgent;

// The order matters here, and this may report false positives for unlisted browsers.

if (sUsrAg.indexOf("Edg") > -1) {
sBrowser = "flicker";
} else if (sUsrAg.indexOf("Chrome") > -1) {
sBrowser = "flicker";
} else if (sUsrAg.indexOf("Safari") > -1) {
sBrowser = "flicker";
} else {
sBrowser = "unknown";
}

let result = sBrowser.includes("flicker");

if (result)
{
document.write('<style type="text/css">body{display:none}</style>');
jQuery(function($) {
$('body').css('display','block');
});
}

Thanks for sharing, glad to hear you manage to find a solution to solve this.