Maybe, but maybe not. If you're using Python/JavaScript and have a ton of dependencies, most of your deploy-time is gonna be spent downloading dependencies. If the host you're using is specifically setup for Python/JavaScript, they can run a registry mirror with 100% of the packages right next to the host, and remove basically most time spent downloading the packages.

Same goes for other time-consuming activities like code coverage or even running the tests. If the applications running on the platform are somewhat heterogeneous, then you can start doing really aggressive performance work.