Comment 5 for bug 1992244

No, I'm afraid that's not fixable easily. It would require the server to
maintain a cache of files between requests. There then becomes disk
usage issues and cache expiry issues that I dont really feel like
dealing with.

You can deal with it in your plugin, cache the result of the last n acsm
calls and re-use it if an indentical acsm is passed again.