[TYPO3-core] RFC: performance enhancement for BE

[Dmitry Dulepov]

Hi!

This is SVN patch request.

Problem: BE has many images. They are static (not changing). Default 
installation does nothing to cache them on the client side. This puts 
caching task to the browser (== to check if image is modified and reload 
it if necessary). At least MSIE does this badly - it always reloads 
every image in the BE causing a lot more traffic than necessary and 
taking resources from httpd process.

Solution: put .htaccess files to several places to the BE with special 
instructions to cache images and css from t3skin. Exact places are:
- typo3/gfx (all BE default icons)
- sysext (mainly impacts t3skin and rtehtmlarea - huge improvement in 
rte loading time!)
- sysext/t3skin/stylesheets (caches only styles)
All .htaccess files define FileETag to MTime+size which is good enough 
and works on all file systems. They also check if mod_expires installed 
and set expiration of cache to 7 days from the current time. This will 
cause "If-modified-since" header from the browser and "Not modified" 
response from the server, which is much faster than normal request/response.

This patch is tested for a couple of weeks in the installation with 
several editors. No one complained but people said that BE works faster now.

Patch is attached.

-- 
Dmitry Dulepov
http://typo3bloke.net/

"It is our choices, that show what we truly are,
far more than our abilities." (A.P.W.B.D.)
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