Perfomance Issues... but how to solve?

[marlonivo]

Is there a Way To make the GitHub Website Builder look like the Website Website Builder. Why: Because my website is getting pretty huge now, and my browser can't handle it anymore without lagging. So, I wanted to change to the local machine as a driver for more power aka the GitHub option, even though I don't know if this fixes the issue, but i unfortenetly found out that the github Repo has a quite different Gui. Pictures following to make my point clear:

how to make to look like:

Thanks for the Attention, and apologizes for my low grade Knowledge about techi stuffi, uwu.