PC connection with 3 RPis

The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries.

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PC connection with 3 RPis

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Image Hey everyone ! I need your help on this one pls !
I've been working on a project lately connecting 3 Raspberry Pi 4 to a "server" PC via Ethernet. Here's a photo to illustrate the system.
https://preview.redd.it/u6jzan6dbk891.p ... p&205cfabe
The communication is working fine. The purpose of all of this is to send 2 images per RPi to the PC with 30 FPS frequency. I'm using ZMQ library and things are also going well with it.
When I set all of this up, I receive the frames but have a delay that is increasing with time (significantly). But weirdly when I replace one RPi with a PC (still connected with ethernet) it works perfectly ! Why is that ? Why would a the system work with 2 RPis and PC and not with 3 RPis.
Thanks a lot for your help.

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