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JSC is very slow when using cryptography #130

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@sirpy

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@sirpy

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When using javascript based crypto libraries such as hdkey (uses crypto.createHmac)
performance is very low
generating 10 addresses with hdkey takes about 1.8 seconds with latest JSC. for comparison:
bundled JSC around 4 sec
react-native-v8 without JIT also around 4 sec
ios simulator 100mili
react-native-v8 with JIT 200mili

Maybe the jsc-bundle is not really configured for JIT? any other explanation for the slow runtime on JSC?

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