The standard version of "polipo" puts a significant burden on the sys-
tem when  "polipo -x" is executed.  This change adds a slight delay to
the associated file-processing loop.  The delay reduces system load at
the cost of file-processing speed.

--- polipo-1.0.4.1.old/diskcache.c
+++ polipo-1.0.4.1/diskcache.c
@@ -2456,6 +2456,8 @@
 
             if(fe->fts_info == FTS_D)
                 continue;
+                                // Make "polipo -x" friendlier
+            usleep ((useconds_t) 60);
 
             if(fe->fts_info == FTS_DP || fe->fts_info == FTS_DC ||
                fe->fts_info == FTS_DNR) {