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> but the browsers, Firefox 101.0.1 and Chrome 102.0.5005.115, both show popup to stop loading script.

I am not sure what that popup is. I do not see it on any of my sites, local or live, using these browsers. Can you at least send a screenshot?

For what it's worth, we have not touched the JavaScript or the backend code for the graph since version 6.0.0.

I am afraid that we cannot reproduce your problem using Firefox 101:

Likewise with Chrome 103:

The graphs loaded within a second and a half. This is from a live site keeping the last 1000 blocked requests.

It is possible that you have a very slow server which takes several dozens of seconds to respond, or you have a third party browser extension or a system-level firewall which blocks the asynchronous request sent to your server to retrieve the data which populates the graph. Off the top of my head there's a timeout of either 30 or 60 seconds for that request. If it takes longer or is completely blocked in a way that it doesn't error out you will indeed get a popup by your browser telling you that the request timed out (that's what you showed me in your screenshot). There is really nothing we can do about the setup of your own host and/or your browser.

There is no way the database query which produces the data can be any faster. It's already using database table indices and SQL query optimisations to be as fast as it can possibly be. If your server is really so slow you can always go to the component's Options and disable the graphs.