Here is an update,
I installed macOS High Sierra on QEMU KVM. I allocated it 4GB ram and 4cores. Ran geekbench on it, and found that it scored more than Ubuntu running as host.
I used geekbench 4 as Geekbench 5 aint compatible with High Sierra.
Ubuntu scored 2676 Single core and 8484 on multi core, while macOS scored 3763 single-core and 9341 on multi core.
I am surprised how it, being virtualised, was able to beat a normal machine, even though what I assigned to guest OS was half of host.
Here is the Ubuntu score ASUSTeK COMPUTER INC. VivoBook_ASUSLaptop X509DA_M509DA - Geekbench Browser
and here is the macos score iMac10,1 - Geekbench Browser
But there are a few limitations like the video memory cant be extended beyond 3MB. The internet speed is slow on it due to lack of proper adapter. But still, that score is really high.