slow SQL Links SQL Server 7.0

Hi,

i tried to connect my delphi4-app with desktop sql server 7.0 via sql links.
It already runs via odbc.

I`m wondering about the fact, that the apps database operations are much
more slower with sql links.
What is wrong ?
Has anybody made similar experiences ?
I thought, one reason to use sql links is better performance.

Bye
    Mic