As stated in the title, I'm beginning a search for an ultra lightweight laptop for doing some software development on the couch or on the go. I'm mostly a Golang / web dev, so not going to be running anything more than VS Code and a web browser, the golang testing stack, and maybe discord. Maybe also Minecraft on rare occasions, though I have a gaming desktop.

I'm genuinely unsure about the notion of a Chromebook, although it sounds like it could be right up my alley. Assuming I go with the C720 and not a Thinkpad Ultrabook of some sort, my questions are as follows:

• I have seen a few mentions of being able to host linux applications as ChromeOS tabs. What software package is this, and is this workflow as nice as it sounds? Can I put ANY application that runs in linux in a tab, for example a terminal window or my Visual Studio Code window?

• How does having both ChromeOS and GalliumOS installed work? I understand it's a chrooted environment, but is there software that allows quick swapping between them without a reboot, sort of like workspaces? Is it basically 3 ways to interact with the two? Booting directly, swapping between them, and hosting linux apps inside ChromeOS? How do you select between those 3?

• The CPU in the C720 worries me a little bit. Nothing I do is particularly intensive for the CPU, but if I wanted to spin up a PostgreSQL instance for testing, or if I had 10-20 website tabs open at once (this happens with fair regularity with me), am I going to suffer in the responsiveness department?

• For upgrading the SSD inside, is this what I want to use? 42mm M.2 SSD, right?

• Are there any other caveats that I might not have thought of or be aware of that would affect me in my particular use case? Is there a better laptop for this price range for what I want?

Thank you all ahead of time for your time and advice. I've done a lot of reading over the last 6 hours, but it is extremely valuable to have the insight and opinions from those who have gone before me.