Does enabling asynchronous parallel metadata downloads in DNF alleviate I/O bottlenecks on Fedora Workstation?

Goal: Determine whether turning on DNF's asynchronous, parallel metadata downloads by default reduces overall transaction time on typical Fedora Workstation hardware without exacerbating I/O contention during large package upgrades.

Uncertainty: While parallel downloads can cut wall‑clock latency, they may increase simultaneous read/write requests, raising queue depth and await times on spinning disks or low‑performance SSDs, and the net effect varies with workload concurrency and storage subsystem.

Questions: Does enabling asynchronous metadata downloads lower the average await time measured by iostat during a DNF upgrade? Does the reduction in total transaction time outweigh any increase in I/O utilization on common HDD and SSD configurations?