Automattic (I presume) added a JavaScript framework to WordPress 6.6, which increased the amount of RAM the server uses. On a small machine, the RAM increase is massive: almost doubling the amount of RAM used.
Nicely, the downgrade of WordPress to version 6.5.5 was easy enough; but, this now leaves a huge question mark for the future. At some point, either my server goes out of date and becomes vulnerable to new-found security flaws, or, I have to start shelling out an additional $84 per year for their new fanciness.
It would be nice if they put a radio button in the administration page to enable or disable the new React JSX stuff.