Instruction: Answer the given question using the supporting document.

Input:
Question: How does it handle 4 USB peripherals with one USB Type B connector per computer?  Time-sharing?  Any lag, or other performance issues noticed?
Document: I use the IO Gear DVI 4-port KVMP switch every single day, often 12 hours per day, 7 days a week. Running a high tech consulting business demands the best equipment to be reliable.I saw the one other reviewer was upset about the cables provided versus their specific home network configuration. They wrote a long rant about their issues which disparaged the company for no good reason.
You can find the needed cables here on amazon. Just note that you need at least a female to female DVI cable and a B type to A type USB cable (like the ones you use for most printers).The switch includes two USB ports for accessories such as thumb drivers or printers. One is located on the front while the other is on the rear. It's actually a nice setup.
Cons:I find myself often having to switch away from and back to a computer, because this switch will glitch and distort monitor colors. I could just have a mildly defective device, but I'm guessing it is just inherent to the way the device is designed.Pros:In spite of its issues, this is probably one of the better 4 port DVI switches available in this price range. Don't get me wrong. That being said, I still don't view this as a four or five star purchase.
I have tried 4 keyboard switches in a very demanding Mac/PC, finicky gaming mouse scenario and finally this one works with my setup. The USB device sharing is one of the better parts.
They're nicely organized into a single bundle per computer, so things don't turn into even more of a spaghetti-like mess than can be helped.Obviously, I haven't been using the device for long (just a day), so we'll see how it holds up over time. I suspect, though, like most electronic devices with few moving parts, unless you get supremely unlucky, it will work silently and reliably for quite some time to come.
I replaced my old VGA KVM switch with this one, mainly because my monitor is now DVI capable and it provides better picture quality.The features I like:Extensive Keyboard Hotkey support.Separate out Video, Audio and USB peripheral connectivity. This is great for having music play from one computer while seeing the display of second computer. The default switch behavior also allows you to keep USB peripherals connected  to one computer while switching to another.Great support for Mac keyboards and mouse too.A bit pricey.
I am currently using it to switch between 3 PC's. I have a wireless keyboard and mouse from rocketfish. To get the keyboard and mouse to work, i had to connect to the generic USB port. While this is slightly inconvenient, the PC's pickup the new keyboard and mouse faster than i can notice the change. I have had no issues with video switching. Overall, i'm very happy with the performance and highly recommend this KVM.
With Windows XP and 7 the device automatically goes to the computer booting up. If you boot 2 computers at the same time, it stays on one and still lets the video drivers load on the others, usually. Sometimes not. So it's bets to boot each computer with the switch set to the computer booting. Once they're all one, switching is easy. The only drawback is I couldn't get all the mouse functions to work through the USB connection. It might be that I had to reload the driver.
I had originally purchased the IOGear 4port VGA kvm switch, but was having major problems - every time I switched between machines there would be a 10-30 second lag before my wireless microsoft keyboard and wired logitech mouse started operating. I decided to send it back and get this one instead. It works perfectly, switching between machines is immediate - no lag time. Also the quality of the DVI image is much better than VGA. I also love that it is completely modular, less clutter is great.
Within a week the replacement unit arrived and the above problem had been solved. The KVM worked flawlessly.......for 2 days. Then, the mouse and keyboard stopped being recognized on position 2. I moved that computer to position 4 and the mouse and keyboard worked. As I write this the KVM is on it's way back to IOGEAR. This time they paid the postage. More later.UPDATE #2. My 3rd KVM arrived within 10 days of sending the 2nd malfunctioning unit back.
Answer: It handles switching between devices with no lag.  It electronically switches.  The only issue I had was switching devices through the keyboard (certain key combos) , I had to manually switch and I am ok with that.  I have found it to be the best KVM switch out there.