Details
-
Bug
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Status: Reopened
-
Minor
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Resolution: Unresolved
-
4.3.0
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None
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Android
Description
Reading a File with
```js
let fr = new FileReader
fr.onload = () => done(fs.result)
fr.readAsArrayBuffer(blob)
```
Is very slow, I'm assuming this is because it reads the whole file, then transfers this via base64 to the JS world, where it is converted to an ArrayBuffer. My use-case involves reading some media metadata in JS-World, this usually involves reading several bytes (maybe around 100b to 1kb) of 2mb to 50mb files.
I noticed this by profiling via Chrome-DevTools where the most time is being spent in the `atob` function in `cordova/base64.toArrayBuffer`.
So parsing some hundreds of bytes on a 3mb file may take around 3 to 4 seconds on my Samsung Galaxy S4 and around 1 second on my Samsung Galaxy S6. (This is without trying to read the actual metadata from the file).
My guess is that this also has a very negative impact on memory usage and garbage collection.