Well, that was fast! 2x0ng 1.2 is now out for Windows and Linux (Mac update soon).
While version 1.1 improved the frame rate for many users, unfortunately I introduced a new bug! Version 1.2 includes a bugfix for that, as well as even more optimizations and tweaks to get the game running smoothly on lower-end systems.
Many thanks to the players who've reported feedback and bugs!
Here are the 1.2 links:
As always, you can find up-to-date compatibility information at the 2x0ng home page: Blocky.io