> [!VacuumDelay] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_timeout_vacuumdelay.png"></td><td><b>Wait Category</b></td><td>Timeout</td></tr><tr><td><b>Mechanism</b></td><td><code>VacuumCostDelay</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3">This wait event represents the <b>Polite Throttling</b> of the maintenance system. To prevent a massive vacuum operation from consuming all available disk I/O and starving your user queries, Postgres uses a cost-based delay mechanism.</td></tr></table>