Very slow loading with 2 CEWP referring to different html files which load the same commons.js

Question

I stumbled on a rather strange issue in SharePoint 2013 On-Prem. Case:

Home.aspx has two CEWP's:

1. Has a content link to /SiteAssets/CustomPages/tableOfContents.html
2. Has a content link to /SiteAssets/CustomPages/adminTools.html

Both HTML files load their own js bundle together with a commons_bundle.js:

tableOfContents.html

<script type="text/javascript" src="../../SiteAssets/js/commons_bundle.js"></script>
<script type="text/javascript" src="../../SiteAssets/js/tableOfContents_bundle.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.runtime.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.taxonomy.js"></script>
<script type="text/javascript">
document.title = "Inhoudstafel - " + _spPageContextInfo.webTitle
ExecuteOrDelayUntilBodyLoaded(function () {
    ExecuteOrDelayUntilScriptLoaded(function () {
        ExecuteOrDelayUntilScriptLoaded(function () {
            ExecuteOrDelayUntilScriptLoaded(function () {
                var args = (window.frameElement) ? window.frameElement.dialogArgs : null;
                spdict.tableOfContents.init("react-webpart", args);
            }, "sp.taxonomy.js");
        }, "sp.js");
    }, "sp.runtime.js");
});
</script>

adminTools.html

<script type="text/javascript" src="../../SiteAssets/js/commons_bundle.js"></script>
<script type="text/javascript" src="../../SiteAssets/js/adminTools_bundle.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.runtime.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.taxonomy.js"></script>
<script type="text/javascript">
ExecuteOrDelayUntilBodyLoaded(function () {
    ExecuteOrDelayUntilScriptLoaded(function () {
        ExecuteOrDelayUntilScriptLoaded(function () {
            ExecuteOrDelayUntilScriptLoaded(function () {
                var args = (window.frameElement) ? window.frameElement.dialogArgs : null;
                spdict.adminTools.init("react-webpart-admin-tools", args);
            }, "sp.taxonomy.js");
        }, "sp.js");
    }, "sp.runtime.js");
});
</script>

As you can see, they both load common_bundle.js. This however seems to cause very slow loading times:

If I comment out commons_bundle.js from the adminTools.html, it loads almost instantly:

---

I have no idea what is causing this behavior. It looks like the two CEWPs are battling about who may load commons_bundle.js. Is there any way to get this to work without commenting out in adminTools.html?

I tried to add the another ExecuteOrDelayUntilScriptLoaded to adminTools.html to let it wait until commons_bundle.js is loaded. But if I do that, it never reaches the initialization.

Any suggestions are welcome! :) Thanks in advance.