DSXchange

That depends entirely on what you mean by "performance".

I meant that use of BASIC Transformer makes a PX job to run in sequential mode.

But I think BASIC Transformer is light weight compared to normal parallel Transformer.

Isn't that so.

No, use of a BASIC Transformer does not make the job run in sequential mode.
No, the BASIC Transform stage cannot be considered lightweight, as the stage is executed within the DataStage Server environment.