Hi mo3art,
some quick thoughts.
You need to be explicit with regard to the terms of the performance related bounus. For instance is it a subjective measure based on an annual review or is it based on individual or team targets (sales, production, service level)?
Are there other employees who are paid on the same basis?
Is there a max limit to the performance element of your pay? Many companies have a limit of 10% or 15%.
Is the company offering matched pension contributions? If so, are they matching the basic and the performance related bonuses?
ajapale