Currently JSBManager::handlerMessage causes performance jank when processing large JSB messages such as Blob transfer chunks. On visionOS JSB message handling is done on the main thread and is unoptimized. Move the processing off the main thread and JSB message handling code.

Currently JSBManager::handlerMessage causes performance jank when processing large JSB messages such as Blob transfer chunks. On visionOS JSB message handling is done on the main thread and is unoptimized. Move the processing off the main thread and JSB message handling code.