[TYPO3-core] RFC: performance enhancement for BE

[Ingmar Schlecht]

Hi Dmitry,

I can confirm that the patch doesn't harm.

+1

cheers
Ingmar

Dmitry Dulepov schrieb:
> 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.