If it is an AHD system, there should not be any "bandwidth" issues that will cause delays to your DVR unit. Unless it is a poorly designed DVR. Other things can be a faulty harddrive causing system instability. In other words if you are using a slower desktop harddrive instead of a CCTV harddrive, like western digitals black drive, or Seagate's SV35 range. But, that is a small possibility. If you are complaining about the remote view, even a 100mb network with cameras on this resolution should not cause problems. Since your internet is more than fast enough I would propose the processor like you stated on this dvr is of a poor quality Or the network port is a problem......
I don't think there is any problem writing to the hard drives -- 2 WD 4 TB drives. I am suspicious of the DVR having a slow processor for one reason because it is very slow to boot up. When I look at DVRs for sale I never see processor specs nor specs for the ethernet speed. I can live with it by manipulating frame rates, bitrates etc. but would rather not. I could buy a much better DVR, but what if it did the same thing?
Don