Speedcrunch vs Microsoft Security Essentials

[Magritte]

I find whenever Microsoft Security Essentials gets a new definition
update it ends up scanning Speedcrunch the next time I load it, which
makes the first launch of Speedcrunch very slow. Subsequent launches
of Speedcrunch are instant, but pretty much the first time I run it
each day it's very slow to come up.

I've tried excluding Speedcrunch from MSE scans but haven't been
successful. Does anyone know of a way to prevent MSE from scanning it
each time? Or is there any possibility of modifying Speedcrunch so
that it doesn't trigger a scan?