Apps running in the development environment and production are different. During assets building before you release the app, there's a compilation stage. PostCSS will be compiled to plain CSS, Babel will be compiled, Jasmine won't affect the production (mostly). In some cases, you can use tree shaking to get rid of the unused code, that would be even better.
So will these modules make you app slower? Yes and no. You can just use the template, but make sure it's well compiled before release.