Most webapps are actually embarassingly parallel (https://en.wikipedia.org/wiki/Embarrassingly_parallel https://en.wikipedia.org/wiki/Embarrassingly_parallel) a

Most webapps are actually embarassingly parallel (https://en.wikipedia.org/wiki/Embarrassingly_parallel https://en.wikipedia.org/wiki/Embarrassingly_parallel) and require little synchronisation. Most of the hard synchronisation problems are solved for you in the DB (at least if you've chosen a good one).