Directory caches.

This uses a rudimentary CPU speed check at launch to gate larger
cache sizes.  (This is on the theory that older systems or those
with weaker CPUs will struggle to walk the cache.)

tcshrc.system.FreeBSD

@@ -2,6 +2,13 @@ _debug "Sourcing tcshrc.system.FreeBSD..."
 
 set cshenv_sort_can_shuffle
 
+set cshenv_speed_estimate=( `sysctl dev.cpu.0.freq` )
+set cshenv_speed_estimate="${cshenv_speed_estimate[2]}"
+
+if( ${cshenv_speed_estimate} > 400 ) then
+	set cshenv_gitdir_cache_size=256
+endif
+
 # Set the acknowledgement bit, essentially
 setenv CSHENV_SYSTEM_CONFIGURED FreeBSD