Looks pretty sensible to me. As a small aside, I noticed when reading '.po' files (that Scratch uses for language translation dictionaries) that explicitly using StandardFileStream in place of MultiByteFileStream in appropriate places could speed up file reading immensely; I suspect your change will solve that worry.

> On 2021-01-22, at 3:24 PM, David T. Lewis <lewis at mail.msen.com> wrote:
> 
> <Speedup-file-upToEnd-dtl.1.cs>


tim
--
tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
Who is General Failure and why is he reading my disk?