Why does File Explorer hang frequently in Windows 8?

Why does File Explorer hang frequently in Windows 8 when I am browsing through a folder containing about 20-30 files and folders?

The program hangs for around ~5-10 seconds like it is still processing. This happens with almost every start. This was not the case before, with Windows 7.

The machine in question is running on an Intel Core i3 3GHz processor with 4GB of RAM.

Answer

For me, the Windows Defender is the cause of this Explorer slowdown. Here is what I get when scrolling through the Explorer:

enter image description here

Look if you also have this high CPU usage. if yes, disable Defender and install a different AV tool.

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