heroku performance and storage problem

hi, I have setup my app on heroku hobby for production. Locally everything works fine but on heroku everything is very very VERY slow. Document response takes about 13 seconds. There is no local storage so I use database driver for session and cache and s3 frankfurt for all uploaded assets.

1. first of all I have no idea how to use view cache when there is no local storage. I even tried using s3:// wrapper for compiled path but it doesn't work on heroku (can't change allow_url_include to true).
2. I have no idea why document generation takes so long before receiving it and I don't know how to debug it.
3. communication with s3 seems also very slow - I get upload timeouts when trying to upload some images and displaying them also takes seconds for each one.

Thanks for help