I just purchased a new SiLabs Radio and it stutters (about 3-5 times per second) on my carpc (PII 800mhz, 256mb) but not on other, faster PC. I noticed that if I unplug my other usb devices, however, the stuttering stops. Pretty much, the only combo that works right now is if I only have my radio plugged in by itself or alongside with the TS. If I plug in anything else, including my usb hub with devices attached, or even just my BT dongle, it starts stuttering again. These devices are being plugged into a 4 port usb 2.0 pcmcia hub. I have no problems with performance on my other devices. Does anyone have any ideas as to what may be going on? Is there any utility that allows me to test the speed of individual USB devices? Thanks.