in reply to Re^2: Memory allocation/performance issue for large strings (of binary data) under Windows.
in thread Memory allocation/performance issue for large strings (of binary data) under Windows.

FWIW: I can confirm that I see similar extreme differences between Ubunto/5.10.0 & Vista/5.10.1 :(

Looking at the differences in compile-time options used: 

Compile-time options: 

Linux:
THREADS_HAVE_PIDS 
USE_REENTRANT_API 


Windows:
PERL_IMPLICIT_SYS 
PL_OP_SLAB_ALLOC 
USE_FAST_STDIO

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Which, if any, of those is the source of the difference ("SLAB_ALLOC"?) will require someone with a much better understanding of the internals to answer.

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