Pop up "Op je systeem is geen appgeheugen meer beschikbaar" (no available app memory)

A couple of weeks ago Bitdefender found and deleted some Generic Trojan horses in an unopened mail when it was moved to the bin. Since that time I get this kind of pop up a couple of times a day, see screenshot. Especially when I am working with Photoshop. The pop up says Photoshop uses over 120 GB (on my 500 GB/16 GB macbook).

I've done a lot of things but I can't get rid of these messages:

  • Bitdefender complete scan which didn't find anything,
  • Completely remove and reinstall Photoshop without succes,
  • A Bitdefender Support Center checklist for "Mijn Mac is erg traag" (My Mac is very slow) with restarting in safe mode and reindexing with Spotlight. Also without succes.

Activity monitor tells Photoshop is using over 100% CPU (I didn't know that is possible).

I am out of ideas so please help.

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