Id say read the reviews. The only possible latency can come from the specialized keyboard port on the kvm because that scans keystrokes for certain magic key combinations that prompt the switch to switch over to the other pc generally default keys for that are pressing scroll lock twice followed by a command for the kvm.
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Do kvm switches add latency. Razers support for their peripherals specifically says that it does not recommend using kvm switches for example. Yes latency time within 1 second while switching between channelsports. Then connect the keyboard display and mouse console to the kvm switch. That being said ive been reading that kvmusb switches can cause issues where you may experience latency difficulty detecting devices etc. Users can use cat5 cables or the specific kvm cable kits to connect the computers to the kvm switch. Synergy and multiplicity both allow you to use a single mouse and keyboard on one machine to control the second machine.
94675 views published on jan 29 2013 new class of ddm kvm switches are the worlds fastest kvm switches with no latency in video usb hid devices keyboard mouse drawing tablets and touch. Which is obviously not cool for gaming. Most kvm switches that support usb have such a general purpose port which is sometimes marked as the mouse port. In a cut through design you may get 90ns latency but you will not be able to apply many acl rules in processing. Im not worried about the latency. Manufacturers base price more on the quality of the switch than on the number of ports provided though it seems in some.
It can control more than two or greater numbers of computers over 500. Some kvms have noticeable input lag and are unacceptable for gaming. Kvm switches range in price from as little as 10 to nearly 200 or more. Im not under any illusions that im a competitive enough gamer for that to matter. However you could do this through software. Im not sure about the ones you linked to though.
It depends on the silicon and methodology used in the switch design and also what processing you are doing to the packet as it traverses the switch. Answered march 19 2018.