Over the last year, we’ve seen big improvements in Scratch performance on the Pi. To date these have resulted from tweaks to the Scratch codebase and the addition of ARMv6-optimized blitting routines to the Squeak Smalltalk VM on which it runs. To give us the next uplift in performance, Tim Rowledge has been busy porting Scratch to a much newer version of Squeak, and he has a very early alpha (i.e. in-progress and therefore buggy) version for you to play with.
Please check out his forum post here and share your feedback.
WARNING! THIS IS A DEVELOPER RELEASE, AND NOT FOR BEGINNERS!