CCTV Camera Surveillance Low Frame rates problem

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networking

Dear friends, we have a setup of some CCTV Surveillance cameras. Where cameras are divided in two pairs and connected to two separate DVRs (Digital Video Recorders). Further both DVRs are connected in parallel to a D-Link switch (24 ports with both up-link and down-link through RF) via two 4 meter straight cables. And switcher is connected to 22 nos. of Puppy PCs for video outputs through copper wires on LAN.
The frame rates are very good on Puppy PCs which are closer to switch up to 4 to 7 meter range but frame rates get very low on PCs that are connected to LAN more than 35 meters of distance.

Is this problem of resistance or distance or there is any other problem?

And what can be the possible solution for this problem?

Please advice.

regards,
(Sushil Kumar Saini)