> [!SpinDelay] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_timeout_spindelay.png"></td><td><b>Wait Category</b></td><td>Timeout</td></tr><tr><td><b>Mechanism</b></td><td><code>s_lock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/Tuple/ModifyTable">ModifyTable</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a>, <a href="Resources/RAM">Memory</a></td></tr><tr><td colspan="3"><b>Ultra-High Concurrency Contention</b>. Spinlocks are the most primitive and fastest synchronization mechanism in Postgres, used to protect extremely small, low-level data structures (such as individual counters or shared memory pointers) that are expected to be held for only a few CPU instructions.</td></tr></table>