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Recently, I stopped using my PC and went back to tinkering with the Raspberry Pi. I bought a hard drive enclosure, connected it to the Pi, set up a Samba server to store downloaded videos, and used it with Infuse on Apple TV.
However, I ran into an issue: the Samba network transfer speed was quite poor—only around 10MB/s! So I started investigating...

Here are the troubleshooting steps:

1. Check if the disk speed is the bottleneck using the following commands:

hdparm -t /dev/sda  # Replace /dev/sda with the correct disk path

# Then run this command to measure disk write speed
dd if=/dev/zero of=/mnt/data/test bs=1M count=1024 oflag=direct

2. Check if the network speed is the bottleneck using iperf3:

# Install if not already installed
sudo apt install iperf3

# Start the server on the Raspberry Pi
iperf3 -s

# Run the client on another device to measure network speed
iperf3 -c <Raspberry Pi IP address> -t 30 -P 4

After following the steps above, I confirmed that the issue was caused by the network. I had been using Wi-Fi on the Raspberry Pi, and switching to a wired Ethernet connection fixed the problem.

A side note: Infuse doesn't seem to handle KMV very well—other formats appear to have slower reading speeds.