Hey everyone,

I wanted to share the results of my recent upgrade project. I've successfully brought my Late 2013 21.5" iMac up to date using OpenCore Legacy
Patcher.

It was quite a bit of work, especially since upgrading the RAM on the 21.5-inch model requires removing the entire logic board, but the effort completely paid
off:
• Memory: Upgraded from 8 GB to 16 GB RAM
• Storage: Replaced the old mechanical HDD with a
solid-state drive (SSD)
• OS: macOS 15.7.7 via OCLP

My previous root patch was from December 31, 2025. After installing the latest patches today, the performance improved significantly.

Everything runs incredibly smooth and feels very responsive now.
Big thanks to the developers behind OCLP for keeping these older machines running so well!