A systems administrator is troubleshooting performance issues with a Windows VDI environment. Users have reported that VDI performance is very slow at the start of the workday, but the performance…

A boot storm occurs when many VDI sessions initialize simultaneously, driving massive parallel disk reads of OS images, application binaries, and user profiles that quickly saturate available disk I/O capacity.

Affinity rules constrain VM placement decisions but would cause consistent performance issues throughout the entire day, not only during the morning startup window.

CPU oversubscription can degrade performance but is less commonly the primary cause of strictly morning-only slowness compared to the disk and RAM pressure of a boot storm.

When all VDI sessions start at once, combined RAM demand spikes sharply - if available memory cannot satisfy all VMs concurrently, memory overcommitment and ballooning or swapping severely degrade performance until the burst subsides.

Insufficient GPU resources would produce consistent sluggishness during graphics-intensive operations at any time of day, not exclusively at startup.

License issues would block logins or terminate sessions outright, not cause intermittent slowness confined to the beginning of the workday.