When one buffer is been transfer, it can accumulate another one, but it won't be sent until the previous is completed. So, it is effectively useless to have a larger buffer, I would even stick with 1 MTU, 1460 bytes for each client.write()
When one buffer is been transfer, it can accumulate another one, but it won't be sent until the previous is completed. So, it is effectively useless to have a larger buffer, I would even stick with 1 MTU, 1460 bytes for each client.write()