[frodo]

sounds weird:
I run MP-II nice & smooth on my laptop which is
- AMD Turion 2GHZ (single core),
-1GB ram
- integrated NVidia 6150 Go with shared video ram
Notice i did set the video ram to 128MB in the bios

Now the only time it 'lags' a little bit is when you open up a new plugin for the first time
Let take my videos as example:

The first time (after starting MP-II) you go to for example my videos, it lags a bit
since it load & initializes the video plugin
You might see a wait-cursor for a brief moment before the my videos screem appears

From that point, using the video plugin is fast
and re-entering the video plugin at any point later on is instant


If this is not the case for you, then you might want to check the cpu% used.
For me MP-II is using 3%-6% cpu (only during plugin initialisation & loading its more)

Frodo