Go to card has become slow

[Richard Gaskin]

The speed difference with stack files seems to be that there's high 
overhead for each write on Windows 10, and stack files are written on a 
series of small writes.

Given this, which would make more sense?:

a) Serialize objects to one buffer in memory
    and flush to disk in one write
    (changes current behavior, but I can't think
     of why anyone would mind)

b) Extend the "save file" command with a flag
    to tell the engine to flush in one write
    (keeps current default behavior, allowing
    the single-flush method as an option)

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
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