QuickAnswer
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Photoshop is heavy. Slow.

Photoshop is heavy. Slow.

If Photoshop is running unusually slow, you can reinstall the entire Adobe CC.

Reviewing and tuning the environment settings is a waste of time. Hurry up and get it done.

Process

https://helpx.adobe.com/jp/creative-cloud/kb/cq08202314.html

Note that
The following will cause your browser to refuse the download for security reasons.
AdobeCreativeCloudCreanerTool.exe
You can view the details and allow the download.

CONTENTS
Web Browser