Performance playing SRT subtitles with 1080p video

Hi, I'm running the latest Serviio version on a Windows XP, pentium 2.7Ghz dual core machine with 2GB of RAM.
When accessing it from my Sony TV and playing a video with 1080p definition and external (srt) subtitle, it is not performing well and video and audio are being interrupted all the time. If I play a video with 720p definition and srt subtitle, it goes fine. If I play a 1080p video without subtitle, it goes fine also.
How can I fix this? Is my machine configuration not enough to be used by Serviio to transcode HD Video (1080p) with external subtitles through DLNA?
Thanks in advance!

[slyguy42o]

sounds like server performance may be a factor, have you looked at your resource usage while playing a video that stutters? I am guessing that both of your cpu's are probably pegged at 100%

[zip]

As it says here: http://www.serviio.org/index.php?option ... icle&id=33

Hardsubs need to transcode, as with your specs it's not coping with 1080p video, obviously

Thanks by all replies. I'm gonna take a look on resource utilization when playing 1080p video with srt subtitle. Any idea on which machine would perform well with this?