2nd DataModul makes DB performance slow !?

Seeing that my DataModul grew up I desided to split in two:
GlobData & LockData.
GlobData contends some common tables/queres & Database.
LockData has  in uses the GlobData to call Database.StartTransaction/
RollBack etc and to reference some of common tables.
The funny think is that program works VISIBLY slower(I use PC 133mhz/48M
RAM!) on Master/details form even if it uses ONLY GlobData datasets.
When I exclude LockData performance boosts again.

Please help.
Joel