Comparison of the afterglow light curves of a sample of high-redshift GRBs (color-coded) to our data (cyan stars). Top: Unabsorbed X-ray luminosity (0.3-10 keV), deduced for GRB250314A from the SVOM/MXT, Swift/XRT, and Einstein Probe/FXT data in Table C.1, and obtained through the Swift burst analyser (Evans et al. 2010) for the other high-redshift GRBs. Bottom: Optical light curves. Each rest-frame light curve is shifted to a common z = 7.3 redshift and to the H band. Only detections redwards of the Ly-α break are included. Optical light curves of high-redshift afterglows are taken from Tanvir et al. (2018) and references therein, Rossi et al. (2022), Brivio et al. (2025).