I had another go with 1.1RC4 last night. I changed a couple of things this time:
1. I did not install PowerDVD10
2. I modified the Vista power settings from Balanced to Performance to remove CPU frequency changes
I did not notice stutter issues this time. I wonder whether the CPU backing off to low speed was at fault? With 1.1 being more sensitive to this for some reason?
After several tweaks like moving timeshift files to ramdisk, I had one remaining problem with short, rather
infrequent, disturbances on channels from a cinergy DVB-C pci card. Channels from a firedtv DVB-T card were however
flawless. After changing power setting to "Performance" also this remaining issue with the DVB-C card seems to be resolved!
Thanks
/Per