[racket] tool performance: Windows vs Linux

Hi all,

I'm using 6.0.1 (64-bit)

I'm developing primarily on Windows 7 (just because) but deploying on 
Ubuntu Linux (14.04).   I've noticed that on Linux the development tools 
start up roughly 10 times faster than on Windows and raco make 
compilation is about 2 seconds for 15 source files [~10K lines] vs 10-20 
seconds per file on Windows [with all files specified on the command 
line because cmd.exe doesn't expand wildcards].

I don't see similar differences in performance of my application [though 
I haven't looked at memory use] ... if there is a speed difference, so 
far it isn't noticeable.   Nor do I see any difference in startup times 
once my application is compiled and *linked*.

However, if I run racket and my application as a collection of scripts 
(doesn't matter pre-compiled with raco or not) there is an enormous 
difference in startup times: 2-3 seconds on Linux vs 30+ seconds on Windows.

Anybody know the reason(s) why the Windows versions (relatively) would 
be so much slower?

Just wondering.
George