I should say graphic device. The stuff I'm talking about is the "on-board" integrated GPU that has to use the CPU to move video data and use system RAM as video memory. In stark contrast to a GPU with dedicated DRAM2/3/4 memory for video, on-board or otherwise. A lot of the newer PCs are built to a price point. Also, some integrated Ethernet devices are all bunk too. They will stream data down to the PC fine but they have very little, if any, ability to stream data from the PC. What you get is a PC that will surf the web really well but suffers doing other tasks. Which is fine for most people's computer needs these days.
I was working with a guy today on a similar issue. Same Intel GMA4500 integrated GPU with a really nice I3 processor. A "modern" computer as compared to my old clunker. He could load a fairly large Gcode file and run well with it. But then he loaded a Solid Cam high speed tool path that consisted of 38,000 lines and the CPU went from 2-3% to 25% and the user interface got clunky. Why? Because the CPU was having to shuffle data in the system RAM to the video card because the tool path got larger than it's 128 MB dedicated memory buffer. Now, contrast that to my 7 year old PC with ATI video cards with real dedicated memory where I loaded a 138,211 line G code file and ran like butter with 1-2% CPU load. His computer's got 5 time the CPU power I do but it performed much worse!
So be wary of the computers you purchase if you intend to do anything other than web surfing, word processing, and email. Computers are a lot like cars. And these new ones have fire breathing CPUs (engines) in them for sure. But if the rest of the components don't match up (bad exhaust or intake), then there will be a bottle neck.
Steve