xymatrix message). If you followed the rule of starting all
entries with a (nonexpandable) character or { then you can insert the declaration
\CompileMatrices
|
in the preamble of your document: this will create temporary
files
containing compiled versions of each
matrix that can be loaded very quickly; they are automatically
recreated when a matrix is changed.
If this causes some diagrams to not work, then such compilation can be
explicitly switched off by using \xymatrixnocompile instead of
\xymatrix. Compilation can be switched completely off with
\NoCompileMatrices (which respects TeX grouping as does
\CompileMatrices, by the way).