HELP WANTED: R1/beta5 boot & hardware testing!

Tested on two machines (USB stick installation).

  1. Fujitsu LifeBook A Series: Intel i5-2450M (2.5 GHz, 2x2 threads), Intel HD Graphics 3000.
    Everything seems to work fine, as it used to work in beta4 nightlys. Custom OpenGL applications and libraries work as expected. Wifi won’t work at boot because Network settings aren’t saved. This is a well-known old bug, I used the workaround found here which partially works (Network settings window pops up, I still have to select WPA/WPA2 security - but at least I don’t have to type the SSID and password every time I boot the system).
    I don’t really have anything else to report about this installation, since I have yet to find anything going wrong.
  2. Dell Precision T3500: Intel Xeon W3550 (3.07 GHz, 4x2 threads), Nvidia Quadro 2000 (GF106GL).
    This machine is more powerful than the laptop above but Haiku doesn’t work properly here. It boots, and applications I tried just as above work as well - when I manage to run them. And I say “when I manage to run them” because there are frequent “hiccups”: the system stalls pretty much everywhere (when moving the mouse, typing on Terminal, etc). It eventually recovers, only to stall again in a few seconds or, if I am lucky, a minute later. Those delays seem unpredictable, not related to a specific user action. In the end the system hangs when I try to shut it down (the shutdown window appears but nothing happens). I experienced similar behavior in nightlys. I am not sure what should I try to figure out what’s going on.