[TYPO3-core] RFC #9657: Instantiate time tracker as null object if not really required

[Rupert Germann]

Hi,

this is a SVN patch request.

Type: performance improvement

Bugtracker references:
http://bugs.typo3.org/view.php?id=9657

Branches: Trunk

Problem:
In the TYPO3 front-end an instance of t3lib_timeTrack is created in the 
variable $TT. During the front-end rendering process the time required 
to parse and execute several scripts and modules is stored using this 
object. When there's no be_user logged in this information is never used 
and so timetracking only eats up precious performance.

Solution:
Use a null object with empty methods in general and only use the current 
time tracker if a logged in be_user views pages in the front-end.


benchmark results:

cached pages:
trunk:		293.83 trans/sec	100%
patched:	308.95 trans/sec	105%

uncached pages:
trunk		34.47 trans/sec		100 %
patched 	37.03 trans/sec		107 %


greets
rupert

"There shall be no new TYPO3 version delivering content slower than its 
predecessor!"