diff -Nur xfce4-diskperf-plugin-2.0/panel-plugin/main.c xfce4-diskperf-plugin-2.0.new/panel-plugin/main.c
--- xfce4-diskperf-plugin-2.0/panel-plugin/main.c	2005-10-11 22:18:15.000000000 +0300
+++ xfce4-diskperf-plugin-2.0.new/panel-plugin/main.c	2006-10-07 10:15:34.000000000 +0300
@@ -141,6 +141,8 @@
 
 	/**************************************************************/
 
+static int timerNeedsUpdate = 0;
+
 static int DisplayPerf (struct diskperf_t *p_poPlugin)
  /* Get the last disk perfomance data, compute the statistics and update
     the panel-docked monitor bars */
@@ -273,6 +275,12 @@
 
     DisplayPerf (poPlugin);
 
+    if (timerNeedsUpdate) {
+        g_source_remove (poPlugin->iTimerId);
+        poPlugin->iTimerId = 0;
+        timerNeedsUpdate = 0;
+    }
+
     if (!poPlugin->iTimerId)
         poPlugin->iTimerId = g_timeout_add (poConf->iPeriod_ms,
 					    (GSourceFunc) SetTimer, poPlugin);
@@ -773,6 +781,7 @@
     struct param_t *poConf = &(poPlugin->oConf.oParam);
     float           r;
 
+    timerNeedsUpdate = 1;
     TRACE ("SetPeriod()\n");
     r = gtk_spin_button_get_value (GTK_SPIN_BUTTON (p_wSc));
     poConf->iPeriod_ms = (r * 1000) + 0.5;	/* rounded */
@@ -1096,8 +1105,6 @@
 {
     diskperf_t *diskperf = diskperf_create_control (plugin);
 
-    diskperf_read_config (plugin, diskperf);
-
     g_signal_connect (plugin, "free-data", G_CALLBACK (diskperf_free), 
                       diskperf);
 
@@ -1120,7 +1127,9 @@
     gtk_container_add (GTK_CONTAINER (plugin), diskperf->oMonitor.wEventBox);
 
     CreateMonitorBars (diskperf, xfce_panel_plugin_get_orientation (plugin));
-    
+
+    diskperf_read_config (plugin, diskperf);
+    DevPerfInit();
     SetTimer (diskperf);
 }