Stacking a mix of 3548's and 2950's.

I have a stack of 4 3548's and 1 2950 that is experiencing slowness, and I was wondering if the fact that the uplink is on switch 3 (a 3548)? Does anyone know if this is an issue? I am using Gigastack GBICs to do the stacking.

No, I've checked the ports, and they're all running at 1 Gig / Half.
The physical topology is as described in the link you provided (daisy-chained), except I have split the stack by running sw 1 & 2 through GBIC 1 on sw 3, and sw 4 & 5 through GBIC 2 on sw 3.
I'm just not certain whether putting the uplink on the middle switch, or splitting the stack, is a concern.

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