I need IDE or editor that provide intellisense for the methods of classes with good speed.
There are several editors that offer such a feature.
As already mentioned [Eclipse PDT and [url=http://www.zend.com/products/studio/]Zend Studio, but also IDE's like [url=http://netbeans.org/]NetBeans and [url=http://www.jetbrains.com/phpstorm/]PhpStorm or [url=http://www.phpedit.com/en]PHPEdit](http://www.eclipse.org/pdt/) offer such features.
pdt eclipse does a form of intellisense. Speed will be up to the horsepower of the computer you're using for eclipse.
Netbeans has it for both standard php classes and user defined classes after they have been "included" or "required" in a php script.