Optimizing fetch response time

[ti-ji]

Optimize fetch api. When the result is json, do not wait for data transfer to complete before performing parsing.

1. Downloading took 1.4 seconds

2. Memory copying took 47ms

3. JSON parsing took 193ms

If we run 2 and 3 at the same time as 1, this will improve response time.

2 should be run at the same time as 1 anyway.

3 should also be run at the same time to compensate for network time

[Jon]

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