optimized performance ... a lot

get() calls are 6x faster
set() calls are 3x faster
feature #92 optimized performance ... a lot (fabpot)

This PR was merged into the master branch.

Discussion
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optimized performance ... a lot

performance improvement when dealing with shared services:

get() calls are 6x faster
set() calls are 3x faster

Commits
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c94869c optimized performance ... a lot