Below is my experience so far.
I installed Monterey on my MacBook Pro 2010 13" 7,1. After installation and a few scary moments I managed to get it installed and working "mostly".
For instance: During the installation my computer seemed to be stuck at the "Less than 1 minute remaining" for such a long time I thought the installation failed or was about to fail. After doing a Google search I saw a posting saying that there is a ton of encryption going on at the end and that being patient is key. It also mentioned that pressing the caps lock key should show green if the computer is functioning normally and still installing. And this was the case, it eventually installed and booted.
2nd issue. Computer rebooted over and over again. Apparently this is normal. Eventually the computer will boot normally and stay that way. At least this was my case.
3rd issue. My Wifi card "looked" like its working but doesn't show any available wifi networks. One suggested work-around was to manually put in your wifi credentials. However, this did not work for me. After checking on the open core site I saw that my WiFi card (Wi-Fi (0x14E4, 0x8D) (Broadcom BCM43xx 1.0) is not supported. I considered ordering a wifi dongle from Amazon. However I could't find one that is compatible with my Macbook with Monterey installed. Or at least I could't find a definite answer. See below for a work around.
4th issue. After some minor use I notice my computer was getting very hot and the CPU seems to be pegging 100% for long periods at a time. Activity Monitor is showing WindowServer is taking a lot of CPU cycles when normally they would or should be low. See below for a work around.
5th issue. Spotlight was also hogging CPU cycles. But eventually it calmed down and is ok now. But for quite a while it wasn't. I thought there was a serious issue. So if this happens to you It might go away eventually. Apparently its building up a database so your Spotlight searches will be faster and more robust.
Fixes and work arounds.
For the Wifi. I noticed I could get Wifi working if I opened "About This Mac" then went to "System Report", then under "Network" I clicked on my Wifi cards properties. Then I would see all available networks in the properties under "Status". Then when I go back to my Wifi setting on the top Menu Bar all the familiar networks that I could pick from showed up. I bet someone could run with this information and make a simple fix.
For the WindowServer issue I read somewhere that they could be calmed down a little if you "reduce transparency" in the Accessibility setting under "Display". And after doing that it really reduced the CPU cycles. Mind you, If you watch Youtube or do many graphically challenging tasks the Computer will get hot again. Sometimes just using Safari with lots of moving graphics I notice the computer gets hot and the fans come on. But Oh well.
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