Chromium = Linux version of Chrome
Chromium isn't the Linux version of Chrome; you can use regular Chrome in Linux too (with just as little effort, for most distributions). Chromium is just the open-source browser, also developed/maintained by Google, that Chrome is built on top of.
I hope you reported that bug, though. Having to refresh for 10-30s is UX-breaking, and issues with Chromium might make their way into Chrome.