Oddbean new post about login | logout This is not really a bottleneck. You initially download only a small number of node informations for bootstrapping.
The bottleneck is not in terms of the volume of data being loaded, but in terms of "centralization". Node data need to be kept up to date all the time. There is also a vulnerability in the substitution of loading nodes. Not that these are insurmountable problems, they just need to be kept in mind.