  The CMS experiment has been designed with a two-level trigger system: the
Level 1 (L1) Trigger, implemented on custom-designed electronics, and the High
Level Trigger (HLT), a streamlined version of the CMS reconstruction and
analysis software running on a computer farm. In order to achieve a good rate
reduction with as little as possible impact on the physics efficiency, the
algorithms used at HLT are designed to follow as closely as possible the ones
used in the offline reconstruction. Here, we will present the algorithms used
for the online reconstruction of electrons and photons (e/$\gamma$), both at L1
and HLT, and their performance and the planned improvements of these HLT
objects.
