Resolving Sudden Lag on iMac Late 2015
If your iMac (Late 2015) is extremely slow after being powered off for months, it's likely due to background indexing tasks and outdated root patches conflicting with silent macOS background updates.
Step-by-Step Fix:
- Wait for Indexing: After a long period of inactivity, Spotlight and iCloud will re-index everything. Leave the Mac on and idle for 2-3 hours.
- Update OCLP App: Your root patches are from December 2025. Download the latest OCLP version (v2.5.0 or newer) to ensure compatibility with recent 15.7.x updates.
- Re-apply Root Patches: Open OCLP, click Post-Install Root Patch, and even if it says they are installed, click Revert Root Patches, reboot, and then Install Root Patches again.
- Check Disk Health: Use Disk Utility to run First Aid on your SSD to ensure no file system corruption occurred during the long shutdown.
Original Question: "Just turned on my iMac for the first time in 2 months returning from vacation; 15.7.3 OpenCore is awfully slow. Help?"
Was on vacation for the past two months.
Am so happy to finally be back home.
Turned on my iMac (late 15’ 16GB/512GB.SSD) running OpenCore 15.7.3 and it lags and I get the beach ball of death upon even just opening or closing a finder window.
Am guessing that in the past two months there may be an update of some sort?
If it matters, within the OpenCore app on my iMac it says under Post-Install Root Patch that “Root Volume last patched v2.4.1, December 24, 2025”
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