Anyone else have issues with their hash-rate not reporting correctly on the site?

I'm trying to test this pool with a lower-power machine I've got *coughalienwarelaptopcough* and I've got it hashing currently (due to needing a cleaning) at ~250 Khashes.

On the site, it fluctuates all over the place (ie from 80 to 220 usually), and often drops to 0 for a while here and there -- meanwhile I'm still connected to the pool and hashing away at those blazing speeds.

Is this an issue with the pool, or am I missing something?  I'd like to see some stability before moving any real hashing power over.