Another alternative to soldering is to use LGB's graphite paste (51010) in the rail jointers.
When compressed between the rails and jointers this paste is conductive so you get better connections that are not permanent. and it prevents corrosion and pitting of the track which will also increase the conductivity.
I use this on my temporary christmas layout and I don't have any problems with lights flickering or hesitation or dead spots on my layout.
Nothing will give you better results then meticulously soldering every joint, but that doesn't mean it is a requirement.
When compressed between the rails and jointers this paste is conductive so you get better connections that are not permanent. and it prevents corrosion and pitting of the track which will also increase the conductivity.
I use this on my temporary christmas layout and I don't have any problems with lights flickering or hesitation or dead spots on my layout.
Nothing will give you better results then meticulously soldering every joint, but that doesn't mean it is a requirement.