Overall download speed and effective web page performance

Question

What are common (non-specific for LAMP, .NET, Ruby, mySql, etc.) tactics and best practices for improving page loading speed?

I am looking for tips on caching, HTTP headers, external file thumbnails (CSS, JS), etc.

And for good tools such as the Google PageSpeed and Yahoo YSlow .

The "final resource" wiki style contains a list of "things that cannot be forgotten" (moderated and updated by all the masters here on SO), is the ultimate goal. So people don’t need to use Google endlessly for outdated blog posts on this subject .;)

_{I hope that the “subjective” modes reassure me, I know that this is a little open. And similar questions have been asked here before. And this stuff partially overlaps with the ServerFault and Webmasters domain . But there is no central “wiki” question that really covers this, so I hope to launch it. There are big questions that I keep talking about SO! Thank youSub>}

Answer 1

• Page Content Caching
• Download javascript at the bottom of the page
• Collapse css (and javascript)
• Css and javascript must be in their [external] files
• js css ( )
• Google jQuery jQuery UI ( , , )
• Gzip
• , , ( )
• ( )
• HTML, .. <H#>
• div-itis ul-itis)
• javascript- , .. $('h1.title') , $('. title')

Answer 2

.

, , , -, - DDOS-.

. , , ajax- , , , , .

ajax , SEO, . ( URL- , ). , - SEO , ajax, ajax . , . , .

cookie . - HTTP-, cookie ( HTTP). - , POST . POST . cookie - -, Varnish, .

edit. - : ESI, , -esi. html, ESI. TTL -Time To Live- (, 1 , 10 , 0 ). , .

, , , , .