Forum Discussion
Extremely Slow Performance Since Defender Was Pushed on Us
Compliance, Security, Protection, and Defender are all extremely slow, with responses from screen to screen ranging from 30 seconds to multiple minutes between clicking items and waiting for Microsof...
You said this exact thing a year ago. Scroll up.
Your issue couldn't be fix by other troubleshooting steps like writing script , running commands and so on. Only Microsoft Engineers could review and release a fix. However, in case you want to investigate the issue yourself, then have a look at:
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/troubleshoot-performance-issues?view=o365-worldwide
You might find some clue there.
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/troubleshoot-performance-issues?view=o365-worldwide
You might find some clue there.
It gets better... I submitted it to them and they reclassified it as Bulk Mail... 😄 It just needs to get out of the way of mail delivery, period. Getting tons of complaints from customers about valid emails being "lost" since they turned this on but decided NOT to notify end users by default.
- Turn off is not a solution, it is just to test if it works or not.
If you have another Anti-Malware solution, it will replace Microsoft Defender and turn it off.
Otherwise, turn it off will put your PC at risk. Reza_Ameri It could be fixed by allowing me to turn it off... Can you believe it filtered the notice there was a response to this post into quarantine? It'd be hysterical if it weren't true...
 Sad