HD .WMV files lagging?

When I play large WMV files, (3G 1920x1080) the video lags for a second every 2 seconds, and the memory usage for the media player goes up to over 1,700,000 K.

This only happens on wmv files. I can play 8G 1020p high resolution mkv and mp4 files with no problem, but can't play hi res wmv files. Any ideas?

These are my specs:

--
K-Lite Codec Pack Full


Windows XP SP2

AMD Radeon HD 6850 - 1024MB

MotherBoard:
ASUSTeK Computer INC. P5K SE Rev 1.xx
Bus Clock: 200 megahertz
BIOS: American Megatrends Inc. 0401 07/19/2007
Realtek Onboard Audio

3328 Megabytes DDR2 RAM

Processor:
2.00 gigahertz Intel Pentium Dual
64 kilobyte primary memory cache
1024 kilobyte secondary memory cache

1400.28 Gigabytes Usable Hard Drive Capacity
100.02 Gigabytes Hard Drive Free Space

 

Are you using internal filters for MKV and MP4? If so, I too noticed a marginal faster rendering. You might try to change the ffdshow video decoder's settings for WMVs, try by disabling it and see if it improves (ffdshow video decoder > codecs).

 

Defragmentation can also improve performance