??=[basics.speeding]
One thing that you will notice is that -pic is sometimes slow in
typesetting diagrams (this is to be expected considering the number
of drawing operations performed as reflected by the number last in
each |xymatrix| message). You can instruct -pic to save the
details of a particular diagram in a file "name"|.xyc| (for `compiled
-pic') every time the diagram changes by replacing the ||
command with
This will cut the typesetting time considerably whenever the diagram
is retypeset without change.
: this is only safe for diagrams that obey the following
restriction: "all entries should start with a non-expandable token"
like an ordinary (non-active) character, ||, or ||.
This is a "v3" feature mentioned here because it is a common
question.