Abstract: A method for data transport optimization in a telecommunication network, in particular, for implementation in a packet switched telecommunication network. The network typically includes at least a first access node, which usually provides access to the telecommunication network. At least a first optimization node, typically including a performance enhancement proxy functionality, is commonly located between a core of the telecommunication network and the at least first access node. Data is generally sent at least from the core in the direction of the at least first access node, from which the data is then typically sent to at least a first client having access to the telecommunication network, usually via an access link to the access node. The access link normally has a varying data transport capacity. Also, a network element generally useful for implementing the method.