Major packet loss every time I ping a different IP Address [on hold]

I have three raspberry pis (micro computers) connected together on a subnet via a hub. I've given them all static IPs and I'm using one main Pi to ping the other two Pis.

Once it starts pinging a Pi, each ping returns back totally fine. But when I initially start the ping it can take up to around 5 seconds to receive it's first response. I'm very new to networking so please let me know what information I can provide to help to diagnose the issue.

I've tried replacing the raspberry pis, the ethernet cables, and the hub. No luck as of yet.

Here is a photo of my current setup:

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Here's a photo of me pinging the two Pis, one at a time:

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