Junk filter malfunctioning

I looked through the report, most of which I don't understand, but I'll mention these items:

I disabled Time machine to try to improve computer performance.

I’ve used Avast and Malware Bytes to identify and quarantine certain adware, etc.

I no longer use Logitech remote control.

I no longer have a Seagate external drive for Time Machine (now using WD)

I don’t need Canon IJ network Scanner at login.

I don’t need Real Player Downloader agent at login.

In startup items, if HP means Hewlitt Packard, I used to have an HP printer over 10 years ago, but don’t now.

Thanks Leroy!

Leroy, Just to give you an update...

Turning off junk filtering doesn't do anything. Junk is still filtered, often mistakenly, as before.

Using advanced settings and setting custom actions doesn't do a thing. For instance: "if sender is in contacts, move message to inbox"... but mail from contacts is still routed to my junk folder. And other custom actions don't work either.

My iMac is less than a year old... I had to disconnect my time machine external drive because it was slowing down my computer so much. That helped, but many processes are still slow.

I regret not having gotten the solid state drive, but I'm still disappointed that the iMac is so clunky.

Leroy, things seem to be noticeably improved! I really appreciate your help in getting my iMac to work smoothly! It had been frustrating me for a long time. You have provided a valuable service at no charge and I'm grateful.

Thanks, I'll explore these links.

also...

If I choose “Mark as junk mail, but leave it in my Inbox”, it doesn't do that either.

Done. I'll let you know how things are doing...

Thanks again.