How to make existsNode faster?

Hi,
i am trying to search in a schema based (object-relational) xml document. With small files (~ 100 Bytes) anything
is alright and the search terminates after one or two seconds. But when I do the same existsNode query on bigger
files (e.g. 1 MB) it takes too much time (don`t know how much because I killed the process after 20 minutes). Can I
do something to gain performance?
Dirk.

schema is:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
     <xsd:complexType name="PurchaseOrderType">
          <xsd:sequence>
               <xsd:element name="PONum" type="xsd:decimal"/>
               <xsd:element name="Company">
               <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                         <xsd:maxLength value="100"/>
                    </xsd:restriction>
               </xsd:simpleType>
               </xsd:element>
               <xsd:element name="Item" maxOccurs="2147483647">
               <xsd:complexType>
                    <xsd:sequence>
                         <xsd:element name="Part">
                              <xsd:simpleType>
                              <xsd:restriction base="xsd:string">
                                   <xsd:maxLength value="1000"/>
                              </xsd:restriction>
                              </xsd:simpleType>
                         </xsd:element>
                         <xsd:element name="Price" type="xsd:float"/>
                    </xsd:sequence>
               </xsd:complexType>
               </xsd:element>
          </xsd:sequence>
     </xsd:complexType>
     <xsd:element name="PurchaseOrder" type="PurchaseOrderType"/>
</xsd:schema>
The XPath is varying dependent from user input.

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