IIRC, the TV hardware and video capture card draw directly to the display hardware and frame buffer. The video signal doesn't go through the CPU, so there will be an extremely small performance hit if any. In this way the hardware is similar to zoomed video on certain newer laptops.
FWIW, I use this feature on a _bunch_ of macs. Throughout college my primary TV was a PowerMac G3 AV and 15" - 21" monitor. Be aware, though, that if you are looking for very high resolution or crisp images, you'll be disappointed. I believe that the hardware actually only captures video at 320x240 and pixel doubles to get to the max size of 640x480 when displaying in full screen mode. Thus, full screen images seem a little fuzzy and chalky. Peace, Drew -- <[EMAIL PROTECTED]> <http://homepage.mac.com/alk/> "Anyone can fly, all you have to do is throw yourself at the ground and miss." -Douglas Adams, Hitchhikers Guide to the Galaxy -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:" Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com