Fork of the main process take too much time

[FlorentinDUBOIS]

Hello,

In production, we saw that the main process use serde_json::to_writer to send its configuration to the new worker which internally use a write syscall which use as delimiter the comma character. This too slow as it perform mostly syscall of 64B to transfer in our use case a state of more than 200MB.

[Keksoj]

this will be greatly improved by #1000 , which itself needs #1060 to be completed first.

[Keksoj]

Since #1039 greatly improved performance on forking the main process (by reducing syscalls), and since further gain in performance are inevitable due to merging the aforementionned #1000 and #1060, we can safely close this issue.