Hi, this is the linux from intel
https://clearlinux.org/
but hold on, I fear there is a problem to make it work on your 2010(?) iMac. It needs an intel processor from 2011 or later. It worked on my late-2011 (Core i7 Sandy Bridge) MacBook Pro but refused to boot on my late-2009 iMac (Core i5 750) Also, wifi didnβt work on the MBP. On the iMac wifi and everything else works under Solus.
Anyway, Solus on the iMac was faster than Clear Linux on the MBP. I still have to find something faster than Solus. I may never find it. π