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MBP8,1 13” late2011 (non metal) and MBP12,1 13" Early2015 are both OTA updated to Sequoia 15.4 using OCLP 2.3.1 from 15.3.2. MBP8,1 general performances seem to be improved! Thank you developers!
Unfortunately, for MBP 8.1 (2011 no Metal) performance has not improved as expected despite various MacOS and OCLP releases. So today I decided to revert to Sonoma with a clean install (14.7.6). The other two MBPs (2012 and 2015), both with Metal, seem to be fine with Sequoia.
 
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