What to expect, when adding my own plugin? (Speed etc.)

Hello,

I’ve got an idea for one specific content page which might be difficult to accomplish with a standard page.
So I was wondering:
What I’ve done before to accomplish that is:

1. Include my required CSS and JS in my page
2. Write the HTML on a local file on my PC
3. Copy and paste the HTML into the HTML block

It’s a bit clunky, but it works.
If I’d pack my code into a plugin that I can use with a shortcode, what impacts would that plugin have?
Would it be checked / loaded on every page load everywhere?
That would probably impact speed/TTFB.

Is there another alternative approach to “develop” special / custom content on just one page?

• This topic was modified 3 years, 1 month ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic