How can I change the main CSS codes?

Hi, I made many CSS changes by adding CSS codes to the theme settings.
Do these codes slow down the website?
Can I change these codes directly from within the main theme?
Thank you in advance for your help.

You are best to start here:

and it will not slow your site down.

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I have posted CSS help to you many times. please read the links that people provide you for information.

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