Reduce bundles and assets sizes

[LukasHirt]

WARNING in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).
This can impact web performance.
Assets: 
  files.bundle.js (638 KiB)

WARNING in entrypoint size limit: The following entrypoint(s) combined asset size exceeds the recommended limit (244 KiB). This can impact web performance.
Entrypoints:
  files (638 KiB)
      files.bundle.js

WARNING in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).
This can impact web performance.
Assets: 
  446f2a78a361f08d8a3c.worker.js (755 KiB)
  vendors~pdfjsWorker.pdf-viewer.chunk.js (730 KiB)
  2.pdf-viewer.chunk.js (421 KiB)

WARNING in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).
This can impact web performance.
Assets: 
  css/core.css (362 KiB)
  core/core.bundle.js (1.62 MiB)
  apps/files/files.bundle.js (638 KiB)
  apps/pdf-viewer/0.pdf-viewer.chunk.js (1.01 MiB)
  apps/pdf-viewer/0.pdf-viewer.chunk.js.map (1.16 MiB)
  apps/pdf-viewer/2.pdf-viewer.chunk.js (421 KiB)
  apps/files/files.bundle.js.map (1.38 MiB)
  apps/pdf-viewer/446f2a78a361f08d8a3c.worker.js (755 KiB)
  apps/pdf-viewer/d39d4b43fecd4dcfa96d.worker.js (1.52 MiB)
  apps/pdf-viewer/d39d4b43fecd4dcfa96d.worker.js.map (1.82 MiB)
  apps/pdf-viewer/f182e640a98f91df235d.worker.js (1.57 MiB)
  apps/pdf-viewer/f182e640a98f91df235d.worker.js.map (1.88 MiB)
  apps/markdown-editor/markdown-editor.bundle.js.map (284 KiB)
  apps/pdf-viewer/vendors~pdfjsWorker.pdf-viewer.chunk.js (730 KiB)
  apps/media-viewer/media-viewer.bundle.js.map (363 KiB)

WARNING in entrypoint size limit: The following entrypoint(s) combined asset size exceeds the recommended limit (244 KiB). This can impact web performance.
Entrypoints:
  core (1.98 MiB)
      css/core.css
      core/core.bundle.js


WARNING in webpack performance recommendations: 
You can limit the size of your bundles by using import() or require.ensure to lazy load some parts of your application.
For more info visit https://webpack.js.org/guides/code-splitting/

[PVince81]

nice to have

[pascalwengerter]

Closing this. Bundle size definitely is an issue but I'd suggest we open dedicated, actionable tickets (e.g. #5342)