> Is this just Squeak?  Do other Smalltalks get it right?
VW of course gets it right. I don't know about others.

> Are there plans to fix this in Squeak?
#compileUseNewCompiler
#compileBlocksAsColsures
The problem is that this makes all blocks (which are not inlined like
#ifTrue:) much slower.

This is a real issue with Seaside as well. In general as soon as you
loop and use and html render block, you are in need of #fixTemps.