From the GitHub release page:
4.1.0’s biggest feature is speed! General execution of Python should be 2-5x faster and display refreshing will be faster as well.
This is the first and hopefully last release candidate. It shouldn’t break any code compatible with previous 4.x releases. Please use the latest 4.x stable release (available from the new website!) when first starting with CircuitPython. It is stable.
Over 60 boards are now supported by CircuitPython 4.1.0. Check out the new circuitpython.org/downloads page for full list of all available versions.
It’s not too late to contribute to CircuitPython! Check out this guide for details. We’re always looking to improve and expect many stable releases in the 4.x line to happen through the summer. Subscribe to the Python for Microcontrollers newsletter on adafruitdaily.com for the latest news for all things Python.
Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).
New Fixes and Features since 4.1.0-rc.0
- Fix Bitmap so it causes screen refreshes. Thanks to @tannewt
- Bitmaps track a dirty area so that TileGrids that just show a full Bitmap are minimally refreshed. This speeds up examples like paint and turtle. Thanks to @tannewt
Thank you to all who used, tested, contributed, helped out, and participated on GitHub and/or Discord:
@adafruit, @AlexHagerman, @anecdata, @ATMakersBill, @baorepo, @C47D, @deshipu, @dhalbert, @elvis-epx, @iot49, @jandjstudios, @jpecor, @jreese, @kattni, @ladyada, @madbodger, @MakerMelissa, @matt-land, @MikeBarela, @Mr. Certainly, @mrmcwethy, @ntavish, @ptorrone, @rce1086, @shazz, @siddacious, @sommersoft, @tannewt, and surely more we have missed. Join us on the Discord chat to collaborate.
Documentation is available in readthedocs.io.
Here are all the changes since 4.1.0-rc.0.