IMac 21,5" late 2013

I have an iMac at home from late 2013 with the following specs:

1 TB, 2,7 ghz intel core i5, 8gb RAM, intel iris Pro 1436 MB.

I heard about open core Legacy patcher from another readdit user and I was wondering what version of the OS would suit me more. Right now I have MacOS Catalina which is 10.15. I was wondering if any further versions (maybe 11) would work smoother with the hardware I have. Right now the computer is feeling very sloppy and it's nearly impossible to perform any kind of task. It is unusable and has been this way for 2-3 years. I appreciate any help thank you very much. I'll provide any further info needed!

submitted by /u/Loose-Assignment3203
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