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Use JSStringCreateWithUTF8CString and skip NSString decoding when loading the bundle

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Summary: public

Benchmarking our startup path has shown we spend a lot of time decoding strings (iPhone 4S / iPhone 5):

* reading a 2MB JS bundle: 35ms / 15ms
* decoding is to an `NSString`: 186ms / 78ms
* transforming that to a `JSString`: 29ms / 10ms

Instead of going through an `NSString` transformation, we generate a null-terminated bundle (0.1ms / 0.05ms to copy the data) and use `JSStringCreateWithUTF8CString` (121ms / 53ms) to generate the string. That makes decoding 70% faster.

Reviewed By: javache

Differential Revision: D2541140

fb-gh-sync-id: 09a016b8edfd46a9b62682c76705564d2024e75e
This commit is contained in:
Frédéric Sagnes
2015-10-16 08:10:25 -07:00
committed by facebook-github-bot-3
parent 8e2ec64763
commit 4a3857ef1d
10 changed files with 47 additions and 35 deletions
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2
React/Modules/RCTSourceCode.h
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@@ -13,7 +13,7 @@
@interface RCTSourceCode : NSObject <RCTBridgeModule>
@property (nonatomic, copy) NSString *scriptText;
@property (nonatomic, copy) NSData *scriptData;
@property (nonatomic, copy) NSURL *scriptURL;
@end