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I've been using my macbook pro with an external monitor for about 1 year now. In the past few weeks though, I'm struggling doing so because my macbook performance drops as soon as I connect it to my external monitor (I have a 1440p LG monitor which I connect to via a Displayport cable). The lag and the poor performance are clearly visible even if I'm simply browsing a web page. If I try to move a window around the desktop it just gets visibly laggy. Temperatures are also quite low (the lag is visible even at 55-60 degrees for the CPU). Just so you know how bad it is, I ran two geekbench tests, with and without external monitor.

Geekbench with external monitor

Geekbench without external monitor

Any suggestions on how to fix?

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  • If you use a different cable, different cable type or different port, do you have the same problem?
    – Paul Schreiber
    Commented Jun 6, 2021 at 20:21
  • Yes I tried 2 different display port cables and a HDMI cable, I tried all ports on both my monitor and macbook, the outcome remains the same.
    – Beter
    Commented Jun 6, 2021 at 20:28
  • If you boot in to safe mode, does the problem recur? What about a different user account?
    – Paul Schreiber
    Commented Jun 7, 2021 at 0:20
  • I havent tried using a different account yet but safe mode doesnt work either. I just tried booting into safe mode and my macbook can't even handle today's apple wwdc stream
    – Beter
    Commented Jun 7, 2021 at 17:39

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