Optimizations

[mikepetridisz]

1. Critical dependencies (SPOF) - may block the entire display of the page in case of failure:

- https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js
- fonts.googleapis.com/css?family=Fira+Sans:400,40[...]italic,500,500italic,700

2. We could reduce 19% (29.5 KiB) by minifying the assets:

- /css/bootstrap/bootstrap.css
- /css/bootstrap/bootstrap-responsive.css
- /css/swc.css

3. 78.7KiB of JavaScript is parsed during initial page load. We could defer parsing JavaScript to reduce blocking of page rendering:

- ajax.googleapis.co[...]n.js (78.5KiB)
- https://openastronomy.org/ (180B of inline JavaScript)

4. These png-s are resized on browser side:

openastronomy.org/img/icons[...]s_icon.png (displayed size: 16x16)
openastronomy.org/img/icons[...]l_icon.png (displayed size: 16x16)
openastronomy.org/img/logo/[...]te_svg.png (displayed size: 125x60)
openastronomy.org/img/icons[...]c_icon.png (displayed size: 16x16)

5. Jekyll - Content Security Policy could be set - e.g:
   We can partially implement it with meta http-equiv or by adding custom headers to _config.yml
   https://jekyllrb.com/docs/configuration/webrick/

# Custom headers
webrick:
  headers:
    Content-Security-Policy: default-src 'none'; script-src 'self'; connect-src 'self'; img-src 'self'; style-src 'self'; 
    My-Other-Header: My-Other-Value

7. We could use this for caching:
   https://github.com/benbalter/jekyll-include-cache

8. We should define a lang attribute on the html root

[bsipocz]

@mikepetridisz - would you be interested in opening a PR for these?

@nabobalis - you said you had plans to revamp the webpage at some point. Is that still in the plans?

[mikepetridisz]

@bsipocz sure!

[nabobalis]

I do still have plans, they are still very much alpha at this stage. It's probably gonna take me a while to finish.