EPG grabbing activated: stuttering while watching videos

[arneman]

TV-Server Version: RC3
MediaPortal Version: RC3
MediaPortal Skin: Bluetwo Wide
Windows Version: XP Prof SP3
CPU Type: AMD X2 3800+
HDD: Samsung HD753LJ
Memory: 2GB
Motherboard: Gigabyte GA-M56S-S3
Video Card: Geforce 8600GT
Video Card Driver: Omega 216921
Sound Card: Onboard
Sound Card AC3:
Sound Card Driver:
1. TV Card: PCTV Sat Pro PCI
1. TV Card Type: DVB-S
1. TV Card Driver: 09/12/2006,4.1.1.0
2. TV Card: PCTV Sat Pro PCI
2. TV Card Type: DVB-S
2. TV Card Driver: 09/12/2006,4.1.1.0
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: PowerDVD 7x
MPEG2 Audio Codec: MPA
h.264 Video Codec: ffdshow
Satelite/CableTV Provider: Astra 19.2
HTPC Case:
Cooling:
Power Supply:
Remote: X10
TV: Toshiba 42Z3030D
TV - HTPC Connection: DVI to HDMI

Hello!

I just want to ask if someone has a solution for following problem: If I activate grabbing EPG in TV Server I have stuttering while watching (non TV) videos, doesn't matter if HD or low quality movies. It seems that the tv server needs for a short time a high CPU load - so it stutters every 10 mins for about 1 sec... It doesn't matter what I change in TV Server Config, it only works when i disable EPG grabbing (idle and while timeshifting). CPU priority settings of MP and TV-Server are normal, but I tried different settings, no solution..

I had this problem since the first time i used MP (about Feb 08), and now, where WEB EPG doesn't work in Germany any more (just for a few channels with tvinfo.de), I need DVB-EPG for EPG data... Can anyone help me?