Optimise CSS/JS delivery.
Implement bundling and CSS optimisation for CSS files.
Get rid of iframe protection.
Get rid of mobile specific CSS for now.
add viewport meta tag
Get rid of disableable ads.
Some minor tweaks for mobile.

Prevent some elements clipping off the page,
and improve font sizing.
Optimise page load behaviour:

  Remove flicker on load,
  Prevent CSS transitions on load
Split assets up into groups to load before and after the content.

Important assets are loaded at the first opportunity possible, less important
assets are loaded after the content.
Force IE-edge.
Fix URLs in CSS bundles not working (by using absolute urls)
Load fonts after content.
Anti spam behaviour changed:

  - Remove all current anti-spam measures
  - New measures are: look for suspicious client behaviour and log probable
      spam bots to a dedicated table.
  - Allow a form submission to remove a client from the table
  - add a DB logging class
Bugfixes for production environment (apparently MySQL is different...)
Enable local logging.