Depends if I need the features in those optional modules. An app is essentially made up from architectural modules (frameworks, alongside anything else that you

Depends if I need the features in those optional modules. An app is essentially made up from architectural modules (frameworks, alongside anything else that you use everywhere), and then specific pieces of functionality (with dependencies that are used less frequently). If the bulk of your bundle size comes from page-specific functionality, then you can easily benefit from code-splitting and tree-shaking techniques. But those techniques won't help you at all when it's your core architecture that are enormous, because every single page on your site depends on it.