Most online video players have heavy code, which slows page load. My Plugin adds only picture of the player, after a user clicks on it, the player code is loaded.
It shows “shortened” links like bit.ly, goo.gl and other link shortering services.
This is my plugin for inserting php code in wordpress. Usually additional code is inserted to functions.php file in theme folder. Add Functions allows you to insert code through admin menu. Code aditor has code highlightning.
Disqus is nice comments system, but realisation for wordpress does not support dofollow commentators links. There is a nice way to make disqus comments dofollow, without updating troubles.
Now my blog is dofollow. You can leave comments. After 3 comments your links become dofollow. I’m going to delete any link, that I suspect being spam.
I use NextGEN Gallery to ,anage images on my blog, but it is better to use separate domain for retrieving images. In this case browser use additional threats to load images and nginx can quick proceed images request.
Nginx is lightweight and quick http server. It is usually used as a caching proxy for apache or php-fastci. I prefer using php-fastcgi.
Here is howto, which allows nginx to use static pages, generated by WP Super Cache.