Sure. Check out my personal website. https://prettydiff.com/

Just open a bunch of windows and you will get to 10k page elements. The primary window shows the page load time in bold red font. The page load time includes all network calls, all initial script execution, state restoration, and graphical rendering. Total load time should always be around 1 second of which most is visual render. The script execution typically takes about 60ms or so but you can see the complete breakdown in the browser performance tab. The CSS could use a lot of clean up. I pulled all of this code from a browser based OS highly distributed OS I am working on.

Also, on that site you can easily check element count in the console using the following custom DOM methods:

    document.getNodesByType(0).length; // all nodes
    document.getNodesByType(1).length; // all elements

I just got to 10000 visible elements on the site and everything still loads in about 850ms, give or take 50ms, on my 7 year old desktop. Base load time for a new user on the same machine is about 550ms, so difference in load time is not significant. The real significance is page repaint on a fully loaded page. Drag and drop of any one window is noticeably slower.

To reset state execute the following and refresh the page:

    delete localStorage["gui-state];