Outlook Logging Slow Windows Boot

My computer had slowed on boot where after a restart or start from power off when the windows dots stop spinning, there is a 18 second black screen to the login screen. It is Win 10 21H2. I do not have fast startup turned on.

I tried chkdsk and sfc and all was fine.

I then deleted the temp files in this folder:

C:\Users\myprofile\AppData\Local\Temp\

But I did not delete the files in "Outlook Logging" which had around 35,000 files totaling around 3GB. Files dates started July 2021 when I first setup this computer.

No change in the delay.

I then deleted a third of the files in "Outlook Logging" and the delay dropped to 12 seconds.

I then deleted all prior to 3/1/22 and the delay dropped to 5 seconds which is comparable to a new similar system I just setup and have not installed Office 365 yet.

Any idea why these temp Outlook Files would cause this?

Most of the temp file start with "SearchProtocolHost_7_0_19401_"

I do not have logging enabled in the Outlook settings.

How much free space you have on C: drive?
Are the "Outlook Logging" files under C:\Users\myprofile\AppData\Local\Temp\ ?

C Drive is a 2TB SSD with 1.35TB Free.

The Outlook logging folder is

C:\Users\myprofile\AppData\Local\Temp\Outlook Logging

See if clean boot makes a difference:

Perform a Clean Boot in Windows 10 to Troubleshoot Software Conflicts

Run:
https://www.tenforums.com/attachment...p_plus_log.bat

By deleting the temp files in Outlook Logging resolved the slow boot. I am just curious why it caused it.

Every week I delete all the content of C:\Users\myprofile\AppData\Local\Temp and C:\windows\temp before I do my backup.
You should run disk cleanup (%windir%\system32\cleanmgr.exe) regularly.
How to automatically run Disk cleanup on Windows 7, 8.x and 10