David Vacca 503a6f4463 Optimize iteration of ReadableNativeMaps ...

Summary:
Props are transferred from C++ to Java using ReadableNativeMaps. The current implementation of ReadableNativeMaps creates an internal HashMap the first time one of its methods is executed.
During the update of props ReadableNativeMaps are consumed only once and they are accessed through an Iterator. That's why there is no reason to create the internal HashMap, which is inefficient from performance and memory point of view.

This diff creates an experiment that avoids the creation of the internal HashMap during prop updates, additionally it removes a lock that was being used in the creation of the internal HashMap. I expect this change to have a positive impact in TTRC and memory (in particular for ME devices)

This diff reduces the amount of ReadableNativeMaps's internal HashMaps created during initial render of MP Home by ~35%.

Changelog: [Internal]

Reviewed By: JoshuaGross

Differential Revision: D25361169

fbshipit-source-id: 7b6efda11922d56127131494ca39b5cec75f1703

2020-12-06 11:28:11 -08:00

..

BUCK

use xplat BUCK attribution

2020-05-15 21:55:52 -07:00

ReactFeatureFlags.java

Optimize iteration of ReadableNativeMaps

2020-12-06 11:28:11 -08:00