> [!NOTE] ![[assets/wl_lwlock_syncrep.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `SyncRepLock` | > | **Operations** | [[Operations/Distributed/Redistribute]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > **Durability Metadata Access Bottleneck**. While the `IPC:SyncRep` wait event represents a backend waiting for a standby to *send* an acknowledgment, this `LWLock:SyncRep` event represents contention for the *internal list* of those acknowledgments.