I think I may have just found a solution to this issue. I am using another background that uses cwav as a dependency, and I have always had issues with it because it wants to load a cwav splash screen that freezes way too often.

On cwav in Wallpaper Engine:

1. Right-click and select "Open in Explorer."
2. Open the "index.html" in a text editor like Notepad, VS Code, etc.
3. Highlight this div:

<div id="loader" class="loader">
<div class="cycle">
<div class="cycle2"></div>
</div>
<div class="img"></div>
</div>

4. Press "CTRL + /" to comment it out.
5. It should now look like this (you could also paste this too if you want, I guess):

<!-- <div id="loader" class="loader">
<div class="cycle">
<div class="cycle2"></div>
</div>
<div class="img"></div>
</div> -->

6. Save the file ("CTRL + S").
7. Open the "js" folder.
8. Replace the "getStyle" function in "loader.js" with this:

getStyle() {
// Prevent error if loader is null
return this.loader ? this.loader.style : {}
}

9. Save the file ("CTRL + S").
10. Force closing and relaunching should be fine, but to be safe I would just restart your computer if you aren’t tech-savvy.
11. If something still does not feel right, I would switch to a different background and reload the one you're trying to use just to refresh it.

edit: If you go to "Default Content" > "imgs" and delete all the images, it helps load even quicker and you do not see a buggy default image load for a second before the background you actually want.