Welcome

I knew you were about to click on that link now read this: -

First of all, you have to understand that both are different ports. ColorOS Port was CN Based so probably no google tracking and background stuff, so it was buttery smooth and fast. OxygenOS is global based, but I had made it smooth and fast as much as I can, but it depends on user too. And don't check the port zip that its 5GB it's a heavy port I can make it to 3.5GB by changing the partition type so there is a reason for being 5GB. I had debloated most of the background google unnecessary stuff. So port is smooth and if you want more smoothness then follow debloat list and tutorial regarding that - Link