Add a cache around prettyprint_pv, since it is consuming a lot of CPU.
-rw-r--r-- 12558 Board.pm
-rw-r--r-- 1107 Engine.pm
-rw-r--r-- 6474 Position.pm
-rw-r--r-- 20485 booklook.c
-rwxr-xr-x 19681 remoteglot.pl
drwxr-xr-x - www