Windows slowly starts up - this is how you find the cause

Make the complaint concrete

Will it take long before the login screen appears, or will the PC only become slow after you are logged in? Those are different situations. A firmware check, an external drive and an app that synchronizes after login can all delay at a different time. Write down what you see and if the problem occurs every time.

Wait for background work to finish at a first start after an update. Then compare a regular restart. Do not draw the conclusion based on one measurement that an app is permanently the cause. Please also note a recent change, such as a new printer, security app or linked network location.

Start Task Manager

Open Task Manager and view CPU, memory and disk activity. A high percentage says something about taxation, but not yet why it arises. See which process is at the top and if that changes after a few minutes. With little available memory, the system can move more data between memory and disk. In the case of busy disk activity, an update, synchronization or indexation may be in progress.

Then view the startup apps. Just turn off programs you recognize and don't need right away. Disable on startup does not delete the app; you can usually open it yourself later. Check again after one change, so you know if that makes a difference.

Use more extensive tools targeted

Autoruns shows many more boot locations, including services and extensions. That's useful if a regular startup list doesn't explain it. It also means that there are components in there that your system needs. Check name, publisher and file path and do not blindly delete everything you don't know.

With Process Explorer you can investigate further processes and open files. Use that to collect information. Forced stopping can cause unsaved work to be lost and is not a structural solution to a recurring problem.

Check free space without randomly erasing

An almost full system disk limits the space for updates and temporary files. With Filelight or WizTree You see where there's a lot of space. Start with your own downloads and archives. Do not delete Windows folders because they are large and use the normal removal feature to remove apps.

1. Note the moment the delay starts.
2. View the tax in Task Manager.
3. Check identifiable boot apps.
4. Change one setting at a time.
5. Restart and compare the same action again.

Recognize when cleaning up doesn't help

Recurrent reading errors, crashes in files or eye-catching disk messages require a backup and further investigation. A health view such as CrystalDiskInfo can provide information, but a favourable status does not exclude any hardware problem. You can also review extra memory or other hardware only after you have determined where the restriction really is.

Save your notes and reverse a change if it has no advantage. This leaves you with a working configuration and prevents the search itself from causing a new problem.