How to Disable the WordPress Heartbeat (Before It Eats Your PHP Workers)

TL;DR The WordPress memory limit error means one PHP request exceeded its per-request RAM ceiling. Raising WP_MEMORY_LIMIT in wp-config.php often fails because two separate ceilings govern shared hosting: the PHP memory_limit and, on CloudLinux, the LVE container cap (PMEM). On AHosting you raise the first yourself in cPanel’s PHP INI Editor with no ticket, while the second rises with your plan tier (512MB Bronze, 1024MB Silver, 2048MB Gold). PHP 8.4 already ships at 256MB, so most sites never hit the wall.