determining throughput speed Cordova bridge. Any insights? - ios

Question

I'm trying to get an idea about the throughput speed of Cordova's WebView-Native bridge. For this I will send a Uint8Array of a determined size. However, I would have expected the throughput speed of this bridge to be higher.
Testing on a iPhone 4s and Cordova 5.4.1 the throughput speed is ~0.8mb/s. This feels low to me (based on some experience with Cordva apps, but this is of course subjective).
Question: is this realistic?
I think that without posting my code this questions show no enough info, therefore I've attached my code:
My JavaScript code:
var success = function(endTime) {
//endTime is unix epoch time (ms)
var time_df = endTime - beginTime
results.push(time_df)
numTests += 1;
sendMessage()
}
var sendMessage = function() {
// execute test 30 times
if (numTests < 30) {
beginTime = +new Date()
bench.send(payload, success, fail)
} else {
console.log('results', results)
}
}
var createPayload = function(size) {
size = size * 1000;
var bufView = new Uint8Array(size);
for (var i = 0; i < size; ++i) {
bufView[i] = i % 20;
}
return bufView.buffer;
}
var startTest = function() {
// create payload of 500kb
payload = createPayload(500)
sendMessage()
}
My Objective-C code.
Code does basicly one thing: return unix epoch time after payload is received.
(void)send:(CDVInvokedUrlCommand*)command
{
NSTimeInterval time = ([[NSDate date] timeIntervalSince1970]); // returned as a double
long digits = (long)time; // this is the first 10 digits
int decimalDigits = (int)(fmod(time, 1) * 1000); // this will get the 3 missing digits
long timestamp = (digits * 1000) + decimalDigits;
NSString *timestampString = [NSString stringWithFormat:#"%ld%d",digits ,decimalDigits];
NSString* callbackId = [command callbackId];
CDVPluginResult* result = [CDVPluginResult
resultWithStatus:CDVCommandStatus_OK
messageAsString:timestampString];
[self success:result callbackId:callbackId];
}