This should really help GetInstanceList to perform better: resolver removed, no more deepcopy, no more useless xml serialization, no more node-set() calls.
<?xml version="1.0"?>
<!DOCTYPE PyObject SYSTEM "PyObjects.dtd">
<PyObject module="node" class="Node" id="148584620">
<attr name="Profile" type="dict" id="148589396" >
</attr>
<attr name="Description" type="string" value="" />
<attr name="Dictionary" type="dict" id="148592132" >
<entry>
<key type="numeric" value="4096" />
<val type="numeric" value="302" />
</entry>
<entry>
<key type="numeric" value="4097" />
<val type="numeric" value="0" />
</entry>
<entry>
<key type="numeric" value="6144" />
<val type="list" id="148585004" >
<item type="string" value="{True:"$NODEID+0x%X80"%(base+1),False:0x80000000}[base<4]" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
</val>
</entry>
<entry>
<key type="numeric" value="5120" />
<val type="list" id="148586060" >
<item type="numeric" value="448" />
<item type="numeric" value="1" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
</val>
</entry>
<entry>
<key type="numeric" value="4101" />
<val type="numeric" value="1073741952" />
</entry>
<entry>
<key type="numeric" value="4102" />
<val type="numeric" value="50000" />
</entry>
<entry>
<key type="numeric" value="8192" />
<val type="numeric" value="0" />
</entry>
<entry>
<key type="numeric" value="6656" />
<val type="list" id="148585228" >
<item type="numeric" value="268501000" />
</val>
</entry>
<entry>
<key type="numeric" value="5632" />
<val type="list" id="148585036" >
<item type="numeric" value="536870920" />
</val>
</entry>
<entry>
<key type="numeric" value="4120" />
<val type="list" id="148585292" >
<item type="numeric" value="0" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
<item type="numeric" value="0" />
</val>
</entry>
<entry>
<key type="numeric" value="4118" />
<val type="list" id="148585100" >
<item type="numeric" value="4195804" />
</val>
</entry>
</attr>
<attr name="SpecificMenu" type="list" id="148584044" >
</attr>
<attr name="ParamsDictionary" type="dict" id="148592268" >
</attr>
<attr name="UserMapping" type="dict" id="148592404" >
<entry>
<key type="numeric" value="8192" />
<val type="dict" id="148592540" >
<entry>
<key type="string" value="need" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="values" />
<val type="list" id="148585868" >
<item type="dict" id="148592676" >
<entry>
<key type="string" value="access" />
<val type="string" value="rw" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="True" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="5" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string">Read Inputs</val>
</entry>
</item>
</val>
</entry>
<entry>
<key type="string" value="name" />
<val type="string">Read Inputs</val>
</entry>
<entry>
<key type="string" value="struct" />
<val type="numeric" value="1" />
</entry>
</val>
</entry>
</attr>
<attr name="DS302" type="dict" id="148592812" >
<entry>
<key type="numeric" value="7968" />
<val type="dict" id="148592948" >
<entry>
<key type="string" value="need" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="values" />
<val type="list" id="148584684" >
<item type="dict" id="148593084" >
<entry>
<key type="string" value="access" />
<val type="string" value="ro" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="5" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Number of Entries" />
</entry>
</item>
<item type="dict" id="148593220" >
<entry>
<key type="string" value="access" />
<val type="string" value="rw" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="15" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Store DCF for node %d[(sub)]" />
</entry>
<entry>
<key type="string" value="nbmax" />
<val type="numeric" value="127" />
</entry>
</item>
</val>
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Store DCF" />
</entry>
<entry>
<key type="string" value="struct" />
<val type="numeric" value="7" />
</entry>
</val>
</entry>
<entry>
<key type="numeric" value="7969" />
<val type="dict" id="148593356" >
<entry>
<key type="string" value="need" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="values" />
<val type="list" id="148585516" >
<item type="dict" id="148593492" >
<entry>
<key type="string" value="access" />
<val type="string" value="ro" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="5" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Number of Entries" />
</entry>
</item>
<item type="dict" id="148593628" >
<entry>
<key type="string" value="access" />
<val type="string" value="rw" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="2" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Storage Format for Node %d[(sub)]" />
</entry>
<entry>
<key type="string" value="nbmax" />
<val type="numeric" value="127" />
</entry>
</item>
</val>
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Storage Format" />
</entry>
<entry>
<key type="string" value="struct" />
<val type="numeric" value="7" />
</entry>
</val>
</entry>
<entry>
<key type="numeric" value="7970" />
<val type="dict" id="148593764" >
<entry>
<key type="string" value="need" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="values" />
<val type="list" id="148594956" >
<item type="dict" id="148593900" >
<entry>
<key type="string" value="access" />
<val type="string" value="ro" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="5" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Number of Entries" />
</entry>
</item>
<item type="dict" id="148594036" >
<entry>
<key type="string" value="access" />
<val type="string" value="rw" />
</entry>
<entry>
<key type="string" value="pdo" />
<val type="False" value="" />
</entry>
<entry>
<key type="string" value="type" />
<val type="numeric" value="15" />
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Concise DCF for Node %d[(sub)]" />
</entry>
<entry>
<key type="string" value="nbmax" />
<val type="numeric" value="127" />
</entry>
</item>
</val>
</entry>
<entry>
<key type="string" value="name" />
<val type="string" value="Concise DCF" />
</entry>
<entry>
<key type="string" value="struct" />
<val type="numeric" value="7" />
</entry>
</val>
</entry>
</attr>
<attr name="ProfileName" type="string" value="None" />
<attr name="Type" type="string">master</attr>
<attr name="ID" type="numeric" value="0" />
<attr name="Name" type="string">TestMaster</attr>
</PyObject>