To run an old document faster, and use the new features of
L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X2<SUB>e</SUB>, you should try using <#671#></I></B></B> L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X2<SUB>e</SUB><#569#><#569#> native mode<B><B><I><#671#>.
However, some documents which can be processed in L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X~2.09
compatibility mode may not work in native mode. Some L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X~2.09
packages will only work with L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X2<SUB>e</SUB><#580#><#580#> in 2.09 compatibility mode.
Some documents will cause errors because of L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X2<SUB>e</SUB>'s improved error
detection abilities.
But most L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X~2.09 documents can be processed by L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X2<SUB>e</SUB><#581#><#581#>'s native
mode with the above change. Again, the easiest way to find out
whether your documents can be processed in native mode is to try it!