Microsoft adds startup apps alert to the Windows 10 21H1 preview builds.
This feature can inform you which program will be added to the startup folder on your Windows 10 computer.
What is Windows 10 Startup folder?
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How to add, disable and fix programs in Startup folder?
To learn more, check out this post right now!
Windows 10 allows you to decide which program to automatically start.
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And your machine will slow down because so many programs are running in the background.
Most of the startup programs are automatically added to the Windows 10 startup folder.
This means that you even dont which program is in the startup app list in some cases.

As time passes, your rig can slow down.
This new feature can tell you the background activities about adding startup programs.
Do you know how to stop programs from running in the background Windows 10?

This post shows you 2 different ways.
To change this later, go to tweaks, Apps, Startup.
This can speed up your system performance.

How to Enable and Disable Startup Programs on Windows 10?
How to Change Startup Programs on Windows 10?
Bottom Line
Windows 10 21H1 will be released in the next year.
Currently, you still cant get any notification when a program is added to the startup app list.
It may influence your setup performance.
Of course, startup apps are not the only influence factors for system slowdown.
you could get more causes and solutions from this post:13 Tips to Windows 10 Very Slow and Unresponsive.
At present, lets just wait for the new Windows 10 version.