What are the reasons for slow loading of the web page? - Web browser

What are the reasons for slow loading of the web page?

- The web pages that are loading slowly might be using heavy scripts or might be getting loaded on an overloaded server.

- If the content like flash is used then the web page performs really slowly in comparison to the normal pages that get created.

- If the caching is inactive on the web browsers and the same web page is getting loaded again and again then the performance get degraded.

- Web pages load slowly due to the content on that page as if it is text it loads faster then the site that is made up of large photographs.

- It takes longer time for a picture to get rendered and the transmission time also remains higher then the text.