Simon Liew shows off a change in SQL Server 2022:
Tempdb often acts as a high-traffic repository in SQL Server, experiencing significant contention. This includes not only temp table usage but also processes such as triggers, worktables for storing intermediate results for spools, cursors, sorts, work files for hash join, and temporary large object (LOB) storage, just to name a few.
A prominent issue is Global Allocation Map (GAM) and Shared Global Allocation Map (SGAM) system page latch contention, which can be particularly problematic under specific high concurrency workloads.
Read on for a demonstration of this.