Posted 23 November 2012 - 16:30
> Is this a good setup?
If it does what you want it to do, then yes, it's a good setup. Cop-out answer, but I don't know how else to answer something that's so subjective.
> Can it decrease performance?
Yes, in the sense that you don't get extra displays without extra processing being done *somewhere*. The real question is, will you notice any slowdown? I would say, probably not. You never identified your video card.
> Will the 19 inch LCD display effect the whole video output? (low quality)
Again, probably not, unless you have some really funky configuration that forces you to use the lowest common denominator (either resolution or refresh rate, or both). Stay away from that crapware from ATI that tries to present both monitors to the OS as a single large display. Ideally, both displays should be driven independently.
I'm personally using 3 identical 24" monitors (1920x1200), and my video card (Radeon HD 6670 from ASUS) has 3 different outputs (DVI, HDMI and DisplayPort). However, in the past I've had all sorts of weird combinations, including a mix of video cards from ATI and Nvidia in the same machine, and haven't had any major problem. Your configuration is downright straightforward by comparison.