Live-system lags so much post-installation

1) Install CachyOS via Calamares. 2) After installation completed, it lags too bad doesn't matter the hardware! I see this issue on both T440 and a laptop with i5 10th generation. Also please remove the CachyOS KDE config/theme from live iso. Even though I appreciate the optimized packages and kernel, this project should be closer to vanilla Arch when possible. Many people are unhappy that this project is over-opinioned. I know this project is still new but still sharing my opinions is important I guess. Thanks.