IVMS 4200 Slow Performance Over Lan. Options?

Have a 64 channel HIKvision NVR with about 36 3mpxl cameras connected. Performance on the NVR console is fine. Loading the 4200 or browser on an I-5 Laptop begins to show high cpu and performance lag. Firefox completely freezes up causing reboot. Could be because it's sending Main Stream instead of Sub stream. The manual appears to show an option to right click on NVR folder and click checkbox to select all to Sub stream. However it's grayed out.

Can't figure out how to fix it. Also desire to send video to remote guard house at gate via PtP wireless bridge and it's really bad there.

Thanks in advance for any suggestions.

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