Anyone trying to do something more resource intensive such as this would also do well to enable swap on ChromeOS. Otherwise you tabs are discarded as memory gets used and those tabs have to be reloaded when you revisit them. ChromeOS was designed to run small memory-footprint tabs, not entire operating systems with apps under them. Enabling swap won't let give you any more memory, but it will make the system feel like it isn't choking under the load and SSD swapping is faster than HDD at least.
I also prefer to run in command-line mode with crouton (
sudo enter-chroot) whenever possible.
Command to enable swap from command line, after hitting Ctrl-Alt-T:
swap enable 2000
Note: I believe swap is now enabled by default in more recent ChromeOS versions, so you can disregard this post now.