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We consider an Early Dark Energy (EDE) cosmological model, and perform ananalysis which takes into account both background and perturbation effects viathe parameters $c^{2}_{\rm eff}$ and $c^{2}_{\rm vis}$, representing effectivesound speed and viscosity, respectively. By using the latest available data wederive constraints on the amount of dark energy at early times and the presentvalue of the equation of state. Our focus is on the effect that early darkenergy has on the Cosmic Microwave Background (CMB) data, includingpolarization and lensing, in a generalized parameter space including a varyingtotal neutrino mass, and tensor to scalar ratio, besides the 6 standardparameters of the minimal cosmological model. We find that the inclusion ofBaryonic Acoustic Oscillations (BAO) data and CMB lensing significantlyimproves the constraints on the EDE parameters, while other high redshift datalike the Quasar Hubble diagram and the Lyman-$\alpha$ forest BAO have instead anegligible impact. We find $\Omega_{\rm eDE} < 0.00391 $ and $w_{0} < -0.9500 $at the $95 \%$ C.L. for EDE accounting for its clustering through the inclusionof perturbation dynamics. This limit becomes weaker $\Omega_{\rm eDE} <0.00337$ if perturbations are neglected. The constraints on the EDE parametersare remarkably stable even when $\Sigma m_{\nu}$, and $r$ parameters arevaried, with weak degeneracies between $\Omega_{\rm eDE}$ and $r$ or $\Sigmam_{\nu}$. Perturbation parameters are not constrained with current data sets,and tensions between the CMB derived $H_0$ and $\sigma_8$ values and thosemeasured with local probes are not eased. This work demonstrates the capabilityof CMB probes to constrain the total amount of EDE well below the percentlevel.

Constraints on the Spacetime Dynamics of an Early Dark Energy Component