Reduce overhead accessing process.env in benchmark

[dittos]

Accessing process.env.NODE_ENV is quite expensive. (See raxjs/server-side-rendering-comparison#5)

The overhead can be reduced by replacing process.env to equivalent plain JS objects. (Ideal solution would be to use minified build...)

Before the patch:

Starting benchmark for 10 concurrent render operations...
renderToString took 17.015370214 seconds
rapscallion, no caching took 16.433021023 seconds; ~1.03x faster
rapscallion, caching DIVs took 3.563874972 seconds; ~4.77x faster
rapscallion, caching DIVs (second time) took 1.517760887 seconds; ~11.21x faster
rapscallion, caching Components took 1.930695494 seconds; ~8.81x faster
rapscallion, caching Components (second time) took 1.562633151 seconds; ~10.88x faster

After the patch:

Starting benchmark for 10 concurrent render operations...
renderToString took 7.380151613 seconds
rapscallion, no caching took 12.990898374 seconds; ~0.56x faster
rapscallion, caching DIVs took 3.098766871 seconds; ~2.38x faster
rapscallion, caching DIVs (second time) took 1.492479727 seconds; ~4.94x faster
rapscallion, caching Components took 1.842742489 seconds; ~4x faster
rapscallion, caching Components (second time) took 1.387480868 seconds; ~5.31x faster

Benchmark is run on Node v7.6.0.

[divmain]

Thank you! It's a downer I didn't consider this before launch, I'd much rather be providing accurate perf data. My benchmarks don't match up with yours too well - what type of machine is this running on?

[divmain]

Here's the current benchmarks on my machine, with Node v6.9.5, for reference:

Starting benchmark for 10 concurrent render operations...
renderToString took 10.678304078 seconds
rapscallion, no caching took 13.097633304 seconds; ~0.81x faster
rapscallion, caching DIVs took 4.392195919 seconds; ~2.43x faster
rapscallion, caching DIVs (second time) took 2.973583364 seconds; ~3.59x faster
rapscallion, caching Components took 2.442791282 seconds; ~4.37x faster
rapscallion, caching Components (second time) took 2.522432894 seconds; ~4.23x faster

I'll pull down Node v7 to try that as well.

[elly44]

Merged commit